An optical image capturing system, sequentially including a first lens element, a second lens element, a third lens element and a fourth lens element from an object side to an image side, is provided. The first lens element has negative refractive power. The second through third lens elements have refractive power. The fourth lens element has positive refractive power. At least one of the image-side surface and the object-side surface of each of the four lens elements are aspheric. The optical lens elements can increase aperture value and improve the imagining quality for use in compact cameras.
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1. An optical image capturing system, from an object side to an image side, comprising:
a first lens element with refractive power and having a first bearing surface of image side on an image-side surface thereof;
a second lens element with refractive power and having a second bearing surface of object side on an object-side surface thereof and a second bearing surface of image side on an image-side surface thereof; and the second bearing surface of object side contacting with the first bearing surface of image side;
a third lens element with refractive power;
a fourth lens element with refractive power; and
an image plane;
wherein the optical image capturing system comprises the four lens elements with refractive powers, a maximum height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is denoted by HOI, at least one of the first through fourth lens elements has positive refractive power, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance on an optical axis from an object-side surface of the first lens element to the image plane is HOS, a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, half of a maximum view angle of the optical image capturing system is HAF, a length of outline curve from an axial point on any surface of any one of the four lens elements to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE, and the following conditions are satisfied: 1.0≤f/HEP≤10.0; 0 deg<HAF≤150 deg and 0.9≤2(ARE/HEP)≤2.0.
10. An optical image capturing system, from an object side to an image side, comprising:
a first lens element with refractive power and having a first bearing surface of image side on the image side thereof;
a second lens element with refractive power and having a second bearing surface of object side on the object-side surface thereof and a second bearing surface of image side on the image-side surface thereof; and the second bearing surface of object side contacting with the first bearing surface of image side;
a third lens element with refractive power and having a third bearing surface of object side on the object-side surface thereof and a third bearing surface of image side on the image-side surface thereof; and the third bearing surface of object side contacting with the second bearing surface of image side;
a fourth lens element with refractive power; and
an image plane;
wherein the optical image capturing system comprises four lens elements with refractive powers, extension lines of the first bearing surface of image side to the second bearing surface of image side intersect with the optical axis intersects to form angles IAG, which are denoted as IAG1 and IAG2, respectively; extension lines of the second bearing surface of object side to the third bearing surface of object side intersect with the optical axis to form angles OAG, which are denoted as OAG2 and OAG3, respectively; at least one lens element among the first through fourth lens elements has positive refractive power, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4 respectively, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, a distance on an optical axis from an object-side surface of the first lens element to the image plane is HOS, a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, half of a maximum view angle of the optical image capturing system is HAF, a length of outline curve from an axial point on any surface of any one of the four lens elements to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE, and the following conditions are satisfied: 0 deg<IAG≤90 deg; 0 deg<OAG≤90 deg; 1.0≤f/HEP≤10.0; 0 deg<HAF≤150 deg and 0.9≤2(ARE/HEP)≤2.0.
20. An optical image capturing system, from an object side to an image side, comprising:
a first lens element with refractive power and having a first bearing surface of image side on the image-side surface thereof;
a second lens element with refractive power and having a second bearing surface of object side on the object-side surface thereof and a second bearing surface of image side on the image-side surface thereof; and the second bearing surface of object side contacting with the first bearing surface of image side;
a third lens element with refractive power and having a third bearing surface of object side on the object-side surface thereof and a third bearing surface of image side on the image-side surface thereof; and the third bearing surface of object side contacting with the second bearing surface of image side;
a fourth lens element with positive refractive power and having a fourth bearing surface of object side on the object-side surface thereof and a fourth bearing surface of image side on the image-side surface thereof; and the fourth bearing surface of object side contacting with the third bearing surface of image side; and
an image plane;
wherein the optical image capturing system comprises four lens elements with refractive powers, extension lines of the first bearing surface of image side to the third bearing surface of image side intersect with the optical axis to form angles IAG, which are denoted as IAG1, IAG2 and IAG3, respectively; extension lines of the second bearing surface of image side to the fourth bearing surface of image side intersect with the optical axis to form angles OAG, which are denoted as OAG2, OAG 3, and OAG4, respectively; at least one lens element among the first through fourth lens elements has positive refractive power, focal lengths of the first through fourth lens elements are f1, f2, f3 and f4 respectively; a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP; a distance on an optical axis from an object-side surface of the first lens element to the image plane is HOS; a distance on an optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL, half of maximum view angle of the optical image capturing system is HAF; a length of outline curve from an axial point on any surface of any one of the four lens elements to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE; and the following conditions are satisfied: 0 deg<IAG≤45 deg; 0 deg<OAG≤45 deg; 1.0≤f/HEP≤10; 0 deg<HAF≤150 deg; and 0.9≤2(ARE/HEP)≤2.0.
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This application claims the benefit of Taiwan Patent Application No. 105109252, filed on Mar. 24, 2016, in the Taiwan Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
1. Field of the Invention
The present disclosure relates to an optical image capturing system, and more particularly to a compact optical image capturing system which can be applied to electronic products.
2. Description of the Related Art
In recent years, with the rise of portable electronic devices having camera functionalities, the demand for an optical image capturing system is raised gradually. The image sensing device of ordinary photographing camera is commonly selected from charge coupled device (CCD) or complementary metal-oxide semiconductor sensor (CMOS Sensor). In addition, as advanced semiconductor manufacturing technology enables the minimization of pixel size of the image sensing device, the development of the optical image capturing system directs towards the field of high pixels. Therefore, the requirement for high imaging quality is rapidly raised.
The traditional optical image capturing system of a portable electronic device comes with different designs, including a second-lens or a third-lens design. However, the requirement for the higher pixels and the requirement for a large aperture of an end user, like functionalities of micro filming and night view, or the requirement of wide view angle of the portable electronic device have been raised. But the optical image capturing system with the large aperture design often produces more aberration resulting in the deterioration of quality in peripheral image formation and difficulties of manufacturing, and the optical image capturing system with wide view angle design increases distortion rate in image formation, thus the optical image capturing system in prior arts cannot meet the requirement of the higher order camera lens module.
Therefore, how to effectively increase quantity of incoming light and view angle of the optical lenses, not only further improves total pixels and imaging quality for the image formation, but also considers the equity design of the miniaturized optical lenses, becomes a quite important issue.
The aspect of embodiment of the present disclosure directs to an optical image capturing system and an optical image capturing lens which use combination of refractive powers, convex and concave surfaces of four-piece optical lenses (the convex or concave surface in the disclosure denotes the geometrical shape of an image-side surface or an object-side surface of each lens on an optical axis) and elements of insertion mechanism for positioning the lens element to increase the amount of light admitted into the optical image capturing system and the view angle of the optical lenses, and to improve total pixels and imaging quality for image formation, so as to be applied to minimized electronic products.
The term and its definition to the lens element parameter in the embodiment of the present invention are shown as below for further reference.
The Lens Element Parameter Related to a Length or a Height in the Lens Element
A height for image formation of the optical image capturing system is denoted by HOI. A height of the optical image capturing system is denoted by HOS. A distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element is denoted by InTL. A distance from the image-side surface of the fourth lens element to an image plane is denoted by InB. InTL+InB=HOS. A distance from an aperture stop (aperture) to an image plane is denoted by InS. A distance from the first lens element to the second lens element is denoted by In12 (example). A central thickness of the first lens element of the optical image capturing system on the optical axis is denoted by TP1 (example).
The Lens Element Parameter Related to a Material in the Lens Element
An Abbe number of the first lens element in the optical image capturing system is denoted by NA1 (example). A refractive index of the first lens element is denoted by Nd1 (example).
The Lens Element Parameter Related to a View Angle in the Lens Element
A view angle is denoted by AF. Half of the view angle is denoted by HAF. A major light angle is denoted by MRA.
The Lens Element Parameter Related to Exit/Entrance Pupil in the Lens Element
An entrance pupil diameter of the optical image capturing system is denoted by HEP. An optical imaging lens system of the exit pupil of the aperture stop means that after the aperture stop behind the lens group and the image space is formed by the image, the exit pupil diameter is expressed in HXP. An entrance pupil diameter of the optical image capturing system is denoted by HEP. A maximum effective half diameter position of any surface of single lens element means the vertical height between the effective half diameter (EHD) and the optical axis where the incident light of the maximum view angle of the system passes through the farthest edge of the entrance pupil on the EHD of the surface of the lens element. For example, the maximum effective half diameter position of the object-side surface of the first lens element is denoted as EHD11. The maximum effective half diameter position of the image-side of the first lens element is denoted as EHD12. The maximum effective half diameter position of the object-side surface of the second lens element is denoted as EHD21. The maximum half effective half diameter position of the image-side surface of the second lens element is denoted as EHD22. The maximum effective half diameter position of any surfaces of the remaining lens elements of the optical image capturing system can be referred as mentioned above.
The Lens Element Parameter Related to Assembly Structures of the Lens Elements
Each object-side surface of each lens element of the optical system may have a bearing surface of object side depending on the requirement, and the image-side surface thereof has a bearing surface of image side. Depending on the requirement, the bearing surface of object side and the bearing surface of image side of each lens element may be respectively configured to be mutually inserted to the adjacent front lens element and the adjacent rear lens element via the contact surfaces thereof, so as to form a stacked structure (the length of the outline of the contact surface in the radial direction of the lens is denoted by BSL). The stacked structure may be designed as a single-insertion structure based on requirement, e.g. the first lens element has a first bearing surface of image side on the image-side surface thereof, and the second lens element has a second bearing surface of object side on the object-side surface thereof, such that the second bearing surface of object side contacts with the first bearing surface of image side and both of them are inserted to each other. Alternatively, the stacked structure may be designed as a double-insertion structure, e.g. a double-insertion structure is provided on the basis of the single-insertion structure. The second lens element has a second bearing surface of image side, the third lens element has a third bearing surface of object side, and the third bearing surface of object side contacts with the second bearing surface of image side such that both of them are inserted to each other.
Alternatively, the structure can be a triple-insertion structure or a full-insertion structure. An optical image capturing system with seven-piece optical lenses, for example, is provided on the basis of double-insertion structure. The third lens element has a third bearing surface of image side on the image-side surface thereof, the fourth lens element has a fourth bearing surface of object side on the object-side surface thereof, and the fourth bearing surface of object side contacts with the third bearing surface of image side such that both of them are inserted to each other. The fourth lens element has a fourth bearing surface of image side on the image-side surface thereof, the fifth lens element has a fifth bearing surface of object side on the object-side surface thereof, and the fifth bearing surface of object side contacts with the fourth bearing surface of image side such that both of them are inserted to each other. The fifth lens element has a fifth bearing surface of image side on the image-side surface thereof, the sixth lens element has a sixth bearing surface of object side on the object-side surface thereof, and the sixth bearing surface of object side contacts with the fifth bearing surface of image side such that both of them are inserted to each other, The sixth lens element has a bearing surface of image side on the image-side surface thereof, the seventh lens element has a seventh bearing surface of object side on the object-side surface thereof, and the seventh bearing surface of object side contacts with the sixth bearing surface of image side such that both of them are inserted to each other.
Take the full-insertion structure of the aforementioned optical image capturing system with seven-piece lenses for example, the extension lines of the first bearing surface of image side to the seventh bearing surface of image side are extending toward the object side or image plane according to requirement and intersect with the optical axis to form angles IAG, which are respectively represented by IAG1, IAG2, IAG3, IAG4, IAG5, IAG6, IAG7. The first bearing surface of object side to the seventh bearing surface of image side are extending to object side or image side according to requirement and have a cross angle of OAG with the optical axis, which are respectively represented by OAG1, OAG2, OAG3, OAG4, OAG5, OAG6, and OAG7.
The values of the angles IAG and OAG mentioned above should be manipulated manually. Generally, the greater the angles IAG and OAG are, the more the optical image capturing system can be minimized, but it will cause the insertion between one lens element and the other to be less secured. Conversely, if the IAG and OAG have a smaller the angle, the degree of minimization of the optical image capturing system will be smaller, but the insertion between one lens element and another is more secured.
The foregoing stacked structure can effectively prevent the tilting of the assembly of lens elements caused by the lack of precision in the inner wall of the positioning structural element during the assembling of the lens elements in the positioning structural element (e.g. the lens barrel), which will affect the quality of the captured image. Besides, when the optical image capturing system of the present invention is to be minimized, or when the pixels of image sensor in the optical image capturing system are to be minimized, the precision of assembly and bearing between one lens element and another will have high impact on the quality of image formation; whereas the aforementioned stacked structure is able to effectively ensure that the performance of each assembled and borne lens element is close to the designed values.
The Lens Element Parameter Related to an Arc Length of the Lens Element Shape and an Outline of Surface
A length of the maximum effective half diameter outline curve at any surface of a single lens element refers to an arc length of a curve, wherein the curve starts from an axial point on the surface of the lens element, travels along the surface outline of the lens element, and ends at the point which defines the maximum effective half diameter; and this arc length is denoted as ARS. For example, the length of the maximum effective half diameter outline curve of the object-side surface of the first lens element is denoted as ARS11. The length of the maximum effective half diameter outline curve of the image-side surface of the first lens element is denoted as ARS12. The length of the maximum effective half diameter outline curve of the object-side surface of the second lens element is denoted as ARS21. The length of the maximum effective half diameter outline curve of the image-side surface of the second lens element is denoted as ARS22. The lengths of the maximum effective half diameter outline curve of any surface of other lens elements in the optical image capturing system are denoted in the similar way.
A length of ½ entrance pupil diameter (HEP) outline curve of any surface of a single lens element refers to an arc length of curve, wherein the curve starts from an axial point on the surface of the lens element, travels along the surface outline of the lens element, and ends at a coordinate point on the surface where the vertical height from the optical axis to the coordinate point is equivalent to ½ entrance pupil diameter; and the arc length is denoted as ARE. For example, the length of the ½ entrance pupil diameter (HEP) outline curve of the object-side surface of the first lens element is denoted as ARE11. The length of the ½ entrance pupil diameter (HEP) outline curve of the image-side surface of the first lens element is denoted as ARE12. The length of the ½ entrance pupil diameter (HEP) outline curve of the object-side surface of the second lens element is denoted as ARE21. The length of the ½ entrance pupil diameter (HEP) outline curve of the image-side surface of the second lens element is denoted as ARE22. The lengths of the ½ entrance pupil diameter (HEP) outline curve of any surface of the other lens elements in the optical image capturing system are denoted in the similar way.
The Lens Element Parameter Related to a Depth of the Lens Element Shape
A distance in parallel with an optical axis from a maximum effective diameter position to an axial point on the object-side surface of the fourth lens element is denoted by InRS41 (example). A distance in parallel with an optical axis from a maximum effective diameter position to an axial point on the image-side surface of the fourth lens element is denoted by InRS42 (example).
The Lens Element Parameter Related to the Lens Element Shape
A critical point C is a tangent point on a surface of a specific lens element, and the tangent point is tangent to a plane perpendicular to the optical axis and the tangent point cannot be a crossover point on the optical axis. To follow the past, a distance perpendicular to the optical axis between a critical point C31 on the object-side surface of the third lens element and the optical axis is HVT31 (example). A distance perpendicular to the optical axis between a critical point C32 on the image-side surface of the third lens element and the optical axis is HVT32 (example). A distance perpendicular to the optical axis between a critical point C41 on the object-side surface of the fourth lens element and the optical axis is HVT41 (example). A distance perpendicular to the optical axis between a critical point C42 on the image-side surface of the fourth lens element and the optical axis is HVT42 (example). Distances perpendicular to the optical axis between critical points on the object-side surfaces or the image-side surfaces of other lens elements and the optical axis are denoted in the similar way described above.
The object-side surface of the fourth lens element has one inflection point IF411 which is nearest to the optical axis, and the sinkage value of the inflection point IF411 is denoted by SGI411 (example). SGI411 is a horizontal shift distance in parallel with the optical axis from an axial point on the object-side surface of the fourth lens element to the inflection point which is nearest to the optical axis on the object-side surface of the fourth lens element. A distance perpendicular to the optical axis between the inflection point IF411 and the optical axis is HIF411 (example). The image-side surface of the fourth lens element has one inflection point IF421 which is nearest to the optical axis and the sinkage value of the inflection point IF421 is denoted by SGI421 (example). SGI421 is a horizontal shift distance in parallel with the optical axis from an axial point on the image-side surface of the fourth lens element to the inflection point which is nearest to the optical axis on the image-side surface of the fourth lens element. A distance perpendicular to the optical axis between the inflection point IF421 and the optical axis is HIF421 (example).
The object-side surface of the fourth lens element has one inflection point IF412 which is the second nearest to the optical axis and the sinkage value of the inflection point IF412 is denoted by SGI412 (example). SGI412 is a horizontal shift distance in parallel with the optical axis from an axial point on the object-side surface of the fourth lens element to the inflection point which is the second nearest to the optical axis on the object-side surface of the fourth lens element. A distance perpendicular to the optical axis between the inflection point IF412 and the optical axis is HIF412 (example). The image-side surface of the fourth lens element has one inflection point IF422 which is the second nearest to the optical axis and the sinkage value of the inflection point IF422 is denoted by SGI422 (example). SGI422 is a horizontal shift distance in parallel with the optical axis from an axial point on the image-side surface of the fourth lens element to the inflection point which is the second nearest to the optical axis on the image-side surface of the fourth lens element. A distance perpendicular to the optical axis between the inflection point IF422 and the optical axis is HIF422 (example).
The object-side surface of the fourth lens element has one inflection point IF413 which is the third nearest to the optical axis and the sinkage value of the inflection point IF413 is denoted by SGI413 (example). SGI413 is a horizontal shift distance in parallel with the optical axis from an axial point on the object-side surface of the fourth lens element to the inflection point which is the third nearest to the optical axis on the object-side surface of the fourth lens element. A distance perpendicular to the optical axis between the inflection point IF413 and the optical axis is HIF413 (example). The image-side surface of the fourth lens element has one inflection point IF423 which is the third nearest to the optical axis and the sinkage value of the inflection point IF423 is denoted by SGI423 (example). SGI423 is a horizontal shift distance in parallel with the optical axis from an axial point on the image-side surface of the fourth lens element to the inflection point which is the third nearest to the optical axis on the image-side surface of the fourth lens element. A distance perpendicular to the optical axis between the inflection point IF423 and the optical axis is HIF423 (example).
The object-side surface of the fourth lens element has one inflection point IF414 which is the fourth nearest to the optical axis and the sinkage value of the inflection point IF414 is denoted by SGI414 (example). SGI414 is a horizontal shift distance in parallel with the optical axis from an axial point on the object-side surface of the fourth lens element to the inflection point which is the fourth nearest to the optical axis on the object-side surface of the fourth lens element. A distance perpendicular to the optical axis between the inflection point IF414 and the optical axis is HIF414 (example). The image-side surface of the fourth lens element has one inflection point IF424 which is the fourth nearest to the optical axis and the sinkage value of the inflection point IF424 is denoted by SGI424 (example). SGI424 is a horizontal shift distance in parallel with the optical axis from an axial point on the image-side surface of the fourth lens element to the inflection point which is the fourth nearest to the optical axis on the image-side surface of the fourth lens element. A distance perpendicular to the optical axis between the inflection point IF424 and the optical axis is HIF424 (example).
The inflection points on the object-side surfaces or the image-side surfaces of the other lens elements and the distances perpendicular to the optical axis thereof or the sinkage values thereof are denoted in the similar way described above.
The Lens Element Parameter Related to an Aberration
Optical distortion for image formation in the optical image capturing system is denoted by ODT. TV distortion for image formation in the optical image capturing system is denoted by TDT. Further, the range of the aberration offset for the view of image formation may be limited to 50%-100%. An offset of the spherical aberration is denoted by DFS. An offset of the coma aberration is denoted by DFC.
The lateral aberration of the stop is denoted as STA to assess the function of the specific optical image capturing system. The tangential fan or sagittal fan may be applied to calculate the STA of any view fields, and in particular, to calculate the STA of the max reference wavelength (e.g. 650 nm) and the minima reference wavelength (e.g. 470 nm) for serve as the standard of the optimal function. The aforementioned direction of the tangential fan can be further defined as the positive (overhead-light) and negative (lower-light) directions. The max operation wavelength, which passes through the STA, is defined as the image position of the specific view field, and the distance difference of two positions of image position of the view field between the max operation wavelength and the reference primary wavelength (e.g. wavelength of 555 nm), and the minimum operation wavelength, which passes through the STA, is defined as the image position of the specific view field, and STA of the max operation wavelength is defined as the distance between the image position of the specific view field of max operation wavelength and the image position of the specific view field of the reference primary wavelength (e.g. wavelength of 555 nm), and STA of the minimum operation wavelength is defined as the distance between the image position of the specific view field of the minimum operation wavelength and the image position of the specific view field of the reference primary wavelength (e.g. wavelength of 555 nm) are assessed the function of the specific optical image capturing system to be optimal. Both STA of the max operation wavelength and STA of the minimum operation wavelength on the image position of vertical height with a distance from the optical axis to 70% HOI (i.e. 0.7 HOI), which are smaller than 50 μm, are served as the sample. The numerical, which are smaller than 30 μm, are also served as the sample.
A maximum height for image formation on the image plane perpendicular to the optical axis in the optical image capturing system is denoted by HOI. A lateral aberration of the longest operation wavelength of a visible light of a positive direction tangential fan of the optical image capturing system passing through an edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as PLTA. A lateral aberration of the shortest operation wavelength of a visible light of the positive direction tangential fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as PSTA. A lateral aberration of the longest operation wavelength of a visible light of a negative direction tangential fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as NLTA. A lateral aberration of the shortest operation wavelength of a visible light of a negative direction tangential fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as NSTA. A lateral aberration of the longest operation wavelength of a visible light of a sagittal fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as SLTA. A lateral aberration of the shortest operation wavelength of a visible light of the sagittal fan of the optical image capturing system passing through the edge of the entrance pupil and incident on the image plane by 0.7 HOI is denoted as SSTA.
The disclosure provides an optical image capturing system, an object-side surface or an image-side surface of the fourth lens element may have inflection points, such that the angle of incidence from each view field to the fourth lens element can be adjusted effectively and the optical distortion and the TV distortion can be corrected as well. Besides, the surfaces of the fourth lens element may have a better optical path adjusting ability to acquire better imaging quality.
The disclosure provides an optical image capturing system, in the order from an object side to an image side, including a first, second, third, and fourth lens elements and an image plane. The first lens element has refractive power and a first bearing surface of image side on the image-side surface thereof. The second lens element has refractive power; and the second lens element has a second bearing surface of object side on the object-side surface and a second bearing surface of image side on the image-side surface thereof. The second bearing surface of object side and the first bearing surface of image side contact with each other. The third lens element has refractive power and the fourth lens element has refractive power. At least one lens element among the four lens elements has positive refractive power. Focal lengths of the first through fourth lens elements are f1, f2, f3, and f4 respectively. A focal length of the optical image capturing system is f. An entrance pupil diameter of the optical image capturing system is HEP. A distance on an optical axis from an object-side surface of the first lens element to the image plane is HOS. A distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL. A half of a maximum view angle of the optical image capturing system is HAF. A length of outline curve from an axial point on any surface of any one of the six lens elements to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE. The following conditions are satisfied: 1.0≤f/HEP≤10.0, 0 deg<HAF≤150 deg and 0.9≤2(ARE/HEP)≤2.0.
The disclosure provides another optical image capturing system, in the order from an object side to an image side, including a first, second, third, and fourth lens elements and an image plane. The first lens element has refractive power and a first bearing surface of image side on the image-side surface thereof. The second lens element has refractive power; and the second lens element has a second bearing surface of object side on the object-side surface and a second bearing surface of image side on the image-side surface thereof. The second bearing surface of object side and the first bearing surface of image side contact with each other. The third lens has a refractive power, a third bearing surface of object side on the object-side surface thereof and a third bearing surface of image side on the image-side surface thereof. The third bearing surface of object side and the second bearing surface of image side contact with each other. The fourth lens element has refractive power. Both of the extension lines of the first bearing surface of image side to the second bearing surface of image side may intersect with the optical axis to form angles IAG, which are IAG1 and IAG2 respectively. The extension lines of the second bearing surface of object side to the third bearing surface of object side may intersect with the optical axis to form angles OAG, namely OAG2 and OAG3. At least one lens element among the first through fourth lens elements has positive refractive power. Focal lengths of the first through fourth lens elements are f1, f2, f3, and f4, respectively. A focal length of the optical image capturing system is f. An entrance pupil diameter of the optical image capturing system is HEP. A distance on an optical axis from an object-side surface of the first lens element to the image plane is HOS. A distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL A half of a maximum view angle of the optical image capturing system is HAF. A length of outline curve from an axial point on any surface of any one of the four lens elements to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE. The following conditions are satisfied: 0 deg<IAG≤90 deg; 0 deg<OAG≤90 deg; 1.0≤f/HEP≤10.0; 0 deg<HAF≤150 deg and 0.9≤2(ARE/HEP)≤2.0.
The disclosure provides another optical image capturing system, in the order from an object side to an image side, including a first, second, third, and fourth lens elements and an image plane. The first lens element has refractive power and a first bearing surface of image side on the image-side surface thereof. The second lens element has refractive power; and the second lens element has a second bearing surface of object side on the object-side surface and a second bearing surface of image side on the image-side surface thereof. The second bearing surface of object side and the first bearing surface of image side contact with each other. The third lens has refractive power, a third bearing surface of object side on the object-side surface thereof and a third bearing surface of image side on the image-side surface thereof. The third bearing surface of object side and the second bearing surface of image side contact with each other. The fourth lens element has refractive power, a fourth bearing surface of object side on the object-side surface thereof and a fourth bearing surface of image side on the image-side surface thereof. All of the extension lines of the first bearing surface of image side to the third bearing surface of image side may intersect with the optical axis to form angles IAG, namely IAG1, IAG2 and IAG3. The extension lines of the second bearing surface of object side to the fourth bearing surface of object side may intersect with the optical axis to form angles OAG, which are OAG2, OAG3 and OAG4 respectively. At least one lens element among the first through the fourth lens elements has positive refractive power. Focal lengths of the first through fourth lens elements are f1, f2, f3, and f4 respectively. A focal length of the optical image capturing system is f. An entrance pupil diameter of the optical image capturing system is HEP. A distance on an optical axis from an object-side surface of the first lens element to the image plane is HOS. A distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL A half of a maximum view angle of the optical image capturing system is HAF. A length of outline curve from an axial point on any surface of any one of the four lens elements to a coordinate point of vertical height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface is denoted as ARE. The following conditions are satisfied: 0 deg<IAG≤45 deg; 0 deg<OAG≤45 deg; 1.0≤f/HEP≤10.0; 0 deg<HAF≤150 deg and 0.9≤2(ARE/HEP)≤2.0.
The length of the outline curve of any surface of a signal lens element in the maximum effective half diameter position affects the functions of the surface aberration correction and the optical path difference in each view field. The longer outline curve may lead to a better function of aberration correction, but the difficulty of the production may become inevitable. Hence, the length of the outline curve of the maximum effective half diameter position of any surface of a signal lens element (ARS) has to be controlled, and especially, the ratio relations (ARS/TP) between the length of the outline curve of the maximum effective half diameter position of the surface (ARS) and the thickness of the lens element to which the surface belongs on the optical axis (TP) has to be controlled. For example, the length of the outline curve of the maximum effective half diameter position of the object-side surface of the first lens element is denoted as ARS11, and the thickness of the first lens element on the optical axis is TP1, and the ratio between both of them is ARS11/TP1. The length of the outline curve of the maximum effective half diameter position of the image-side surface of the first lens element is denoted as ARS12, and the ratio between ARS12 and TP1 is ARS12/TP1. The length of the outline curve of the maximum effective half diameter position of the object-side surface of the second lens element is denoted as ARS21, and the thickness of the second lens element on the optical axis is TP2, and the ratio between both of them is ARS21/TP2. The length of the outline curve of the maximum effective half diameter position of the image-side surface of the second lens element is denoted as ARS22, and the ratio between ARS22 and TP2 is ARS22/TP2. The ratio relations between the lengths of the outline curve of the maximum effective half diameter position of any surface of the other lens elements and the thicknesses of the lens elements to which the surfaces belong on the optical axis (TP) are denoted in the similar way.
The length of outline curve of half of an entrance pupil diameter of any surface of a single lens element especially affects the functions of the surface aberration correction and the optical path difference in each shared view field. The longer outline curve may lead to a better function of aberration correction, but the difficulty of the production may become inevitable. Hence, the length of outline curve of half of an entrance pupil diameter of any surface of a single lens element has to be controlled, and especially, the ratio relationship between the length of outline curve of half of an entrance pupil diameter of any surface of a single lens element and the thickness on the optical axis has to be controlled. For example, the length of outline curve of the half of the entrance pupil diameter of the object-side surface of the first lens element is denoted as ARE11, and the thickness of the first lens element on the optical axis is TP1, and the ratio thereof is ARE11/TP1. The length of outline curve of the half of the entrance pupil diameter of the image-side surface of the first lens element is denoted as ARE12, and the thickness of the first lens element on the optical axis is TP1, and the ratio thereof is ARE12/TP1. The length of outline curve of the half of the entrance pupil diameter of the object-side surface of the first lens element is denoted as ARE21, and the thickness of the second lens element on the optical axis is TP2, and the ratio thereof is ARE21/TP2. The length of outline curve of the half of the entrance pupil diameter of the image-side surface of the second lens element is denoted as ARE22, and the thickness of the second lens element on the optical axis is TP2, and the ratio thereof is ARE22/TP2. The ratio relationship of the remaining lens elements of the optical image capturing system can be referred as mentioned above.
The optical image capturing system described above may be configured to form the image on the image sensing device which is shorter than 1/1.2 inch in diagonal length. The pixel size of the image sensing device is smaller than 1.4 micrometers (μm). Preferably the pixel size thereof is smaller than 1.12 micrometers (μm). The best pixel size thereof is smaller than 0.9 micrometers (μm). Furthermore, the optical image capturing system is applicable to the image sensing device with aspect ratio of 16:9.
The optical image capturing system described above is applicable to the demand of video recording with above millions or ten millions-pixels (e.g. 4K2K or the so-called UHD and QHD) and leads to a good imaging quality.
The height of optical system (HOS) may be reduced to achieve the minimization of the optical image capturing system when the absolute value of f1 is larger than f6 (|f1|>f4).
When |f2|+|f3|>|f1|+|f4| are satisfied with above relations, at least one of the second through third lens elements may have weak positive refractive power or weak negative refractive power. The weak refractive power indicates that an absolute value of the focal length of a specific lens element is greater than 10. When at least one of the second through third lens elements has the weak positive refractive power, the positive refractive power of the first lens element can be shared, such that the unnecessary aberration will not appear too early. On the contrary, when at least one of the second through third lens elements has the weak negative refractive power, the aberration of the optical image capturing system can be corrected and fine-tuned.
The fourth lens element may have positive refractive power and a concave image-side surface. Hereby, the back focal length is reduced for keeping the miniaturization, to miniaturize the lens element effectively. In addition, at least one of the object-side surface and the image-side surface of the four lens element may have at least one inflection point, such that the angle of incident with incoming light from an off-axis view field can be suppressed effectively and the aberration in the off-axis view field can be corrected further.
The detailed structure, operating principle and effects of the present disclosure will now be described in more details hereinafter with reference to the accompanying drawings that show various embodiments of the present disclosure as follows.
Reference will now be made in detail to the exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Therefore, it is to be understood that the foregoing is illustrative of exemplary embodiments and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed exemplary embodiments, as well as other exemplary embodiments, are intended to be included within the scope of the appended claims. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art. The relative proportions and ratios of elements in the drawings may be exaggerated or diminished in size for the sake of clarity and convenience in the drawings, and such arbitrary proportions are only illustrative and not limiting in any way. The same reference numbers are used in the drawings and the description to refer to the same or like parts.
It will be understood that, although the terms ‘first’, ‘second’, ‘third’, etc., may be used herein to describe various elements, these elements should not be limited by these terms. The terms are used only for the purpose of distinguishing one component from another component. Thus, a first element discussed below could be termed a second element without departing from the teachings of embodiments. As used herein, the term “or” includes any and all combinations of one or more of the associated listed items.
An optical image capturing system, in order from an object side to an image side, includes a first, second, third, and fourth lens elements with refractive power and an image plane. The optical image capturing system may further include an image sensing device which is disposed on an image plane.
The optical image capturing system may use three sets of wavelengths which are 486.1 nm, 587.5 nm and 656.2 nm, respectively, wherein 587.5 nm is served as the primary reference wavelength and a reference wavelength for retrieving technical features. The optical image capturing system may also use five sets of wavelengths which are 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, wherein 555 nm is served as the primary reference wavelength and a reference wavelength for retrieving technical features.
A ratio of the focal length f of the optical image capturing system to a focal length fp of each of lens elements with positive refractive power is PPR. A ratio of the focal length f of the optical image capturing system to a focal length fn of each of lens elements with negative refractive power is NPR. A sum of the PPR of all lens elements with positive refractive power is ΣPPR. A sum of the NPR of all lens elements with negative refractive powers is ΣNPR. It is beneficial to control the total refractive power and the total length of the optical image capturing system when following conditions are satisfied: 0.5≤ΣPPR/|ΣNPR|≤4.5. Preferably, the following relation may be satisfied: 0.9≤ΣPPR/|ENPR|≤3.5.
The height of the optical image capturing system is HOS. It will facilitate the manufacturing of miniaturized optical image capturing system which may form images with ultra high pixels when the specific ratio value of HOS/f tends to 1.
In the optical image capturing system of the disclosure, a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL. A total central thickness of all lens elements with refractive power on the optical axis is ΣTP. The following relation is satisfied: 0<ΣPP≤200; and f4/ΣPP≤0.85. Preferably, the following relations may be satisfied: 0<ΣPP≤150 and 0.01≤f4/ΣPP≤0.7. Hereby, contrast ratio for the image formation in the optical image capturing system and defect-free rate for manufacturing the lens element can be balanced, and a proper back focal length is provided to dispose other optical components in the optical image capturing system.
The optical image capturing system may further include an image sensing device which is disposed on an image plane. Half of a diagonal of an effective detection field of the image sensing device (imaging height or the maximum image height of the optical image capturing system) is HOI. A distance on the optical axis from the object-side surface of the first lens element to the image plane is HOS. The following relations are satisfied: HOS/HOI≤15 and 0.5≤HOS/f≤20.0. Preferably, the following relations may be satisfied: 1≤HOS/HOI≤10 and 1≤HOS/f≤15. Hereby, the miniaturization of the optical image capturing system can be maintained effectively, so as to be carried by lightweight portable electronic devices.
In addition, in the optical image capturing system of the disclosure, according to different requirements, at least one aperture stop may be arranged for reducing stray light and improving the imaging quality.
In the optical image capturing system of the disclosure, the aperture stop may be a front or middle aperture. The front aperture is the aperture stop between a photographed object and the first lens element. The middle aperture is the aperture stop between the first lens element and the image plane. If the aperture stop is the front aperture, a longer distance between the exit pupil and the image plane of the optical image capturing system can be formed, such that more optical elements can be disposed in the optical image capturing system and the efficiency of receiving images of the image sensing device can be raised. If the aperture stop is the middle aperture, the view angle of the optical image capturing system can be expended, such that the optical image capturing system has the same advantage that is owned by wide angle cameras. A distance from the aperture stop to the image plane is InS. The following relation is satisfied: 0.2≤InS/HOS≤1.1. Preferably, the following relations may be satisfied: 0.4≤InS/HOS≤1. Hereby, the miniaturization of the optical image capturing system can be maintained while the feature of the wild-angle lens element can be achieved.
In the optical image capturing system of the disclosure, a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element is InTL. A sum of central thicknesses of all lens elements with refractive power on the optical axis is ΣTP. The following relation is satisfied: 0.2≤ΣTP/InTL≤0.95. Preferably, the following relation may be satisfied: 0.2≤ΣTP/InTL≤0.9. Hereby, contrast ratio for the image formation in the optical image capturing system and defect-free rate for manufacturing the lens element can be given consideration simultaneously, and a proper back focal length is provided to dispose other optical components in the optical image capturing system.
A curvature radius of the object-side surface of the first lens element is R1. A curvature radius of the image-side surface of the first lens element is R2. The following relation is satisfied: 0.01≤|R1/R2|≤100. Hereby, the first lens element may have proper strength of the positive refractive power, so as to avoid the longitudinal spherical aberration to increase too fast. Preferably, the following relation may be satisfied: 0.01≤|R1/R2|≤60.
A curvature radius of the object-side surface of the fourth lens element is R9. A curvature radius of the image-side surface of the fourth lens element is R10. The following relation is satisfied: −200<(R7−R8)/(R7+R8)<30. Hereby, the astigmatism generated by the optical image capturing system can be corrected beneficially.
A distance between the first lens element and the second lens element on the optical axis is IN12. The following relation is satisfied: 0<IN12/f≤5.0. Preferably, the following relations may be satisfied: 0.01≤IN12/f≤4.0. Hereby, the chromatic aberration of the lens elements can be improved, such that the performance can be increased.
A distance between the second lens element and the third lens element on the optical axis is IN23. The following relation is satisfied: 0<IN23/f≤5.0. Preferably, the following relation may be satisfied: 0.01≤IN23/f≤3.0. Hereby, the performance of the lens elements can be improved.
A distance between the third lens element and the fourth lens element on the optical axis is IN34. The following relation is satisfied: 0<IN34/f≤5.0. Preferably, the following relation may be satisfied: 0.001≤IN34/f≤3.0. Hereby, the performance of the lens elements can be improved.
Central thicknesses of the first lens element and the second lens element on the optical axis are TP1 and TP2, respectively. The following relation is satisfied: 1≤(TP1+IN12)/TP2≤20. Hereby, the sensitivity produced by the optical image capturing system can be controlled, and the performance can be increased.
Central thicknesses of the third lens element and the fourth lens element on the optical axis are TP3 and TP4, respectively, and a distance between the aforementioned two lens elements on the optical axis is IN34. The following relation is satisfied: 0.2≤(TP4+IN34)/TP4≤20. Hereby, the sensitivity produced by the optical image capturing system can be controlled and the total height of the optical image capturing system can be reduced.
A distance between the second lens element and the third lens element on the optical axis is IN23. A total sum of distances from the first lens element to the fourth lens element on the optical axis is ΣTP. The following relation is satisfied: 0.01≤IN23/(TP2+IN23+TP3)≤0.9. Preferably, the following relation may be satisfied: 0.05≤IN23/(TP2+IN23+TP3)≤0.7. Hereby, the aberration generated by the process of moving the incident light can be adjusted slightly layer upon layer, and the total height of the optical image capturing system can be reduced.
In the optical image capturing system of the disclosure, a distance in parallel with an optical axis from a maximum effective diameter position to an axial point on the object-side surface 142 of the fourth lens element is InRS41 (InRS41 is positive if the horizontal displacement is toward the image-side surface, or InRS41 is negative if the horizontal displacement is toward the object-side surface). A distance in parallel with an optical axis from a maximum effective diameter position to an axial point on the image-side surface 144 of the fourth lens element is InRS42. A central thickness of the fourth lens element 140 on the optical axis is TP4. The following relations are satisfied: −1 mm≤InRS41≤1 mm, −1 mm≤InRS42≤1 mm, 1 mm≤|InRS41|+|InRS42|≤2 mm, 0.01≤|InRS41|TP4≤10 and 0.01≤|InRS42/TP4≤10. Hereby, the maximum effective diameter position between both surfaces of the fourth lens element can be controlled, so as to facilitate the aberration correction of peripheral field of view of the optical image capturing system and maintain its miniaturization effectively.
In the optical image capturing system of the disclosure, a distance in parallel with an optical axis from an inflection point on the object-side surface of the fourth lens element which is nearest to the optical axis to an axial point on the object-side surface of the fourth lens element is denoted by SGI411. A distance in parallel with an optical axis from an inflection point on the image-side surface of the fourth lens element which is nearest to the optical axis to an axial point on the image-side surface of the fourth lens element is denoted by SGI421. The following relations are satisfied: 0<SGI411/(SGI411+TP4)≤0.9 and 0<SGI421/(SGI421+TP4)≤0.9. Preferably, the following relations may be satisfied: 0.01<SGI411/(SGI411+TP4)≤0.7 and 0.01<SGI421/(SGI421+TP4)≤0.7.
A distance in parallel with the optical axis from the inflection point on the object-side surface of the fourth lens element which is the second nearest to the optical axis to an axial point on the object-side surface of the fourth lens element is denoted by SGI412. A distance in parallel with an optical axis from an inflection point on the image-side surface of the fourth lens element which is the second nearest to the optical axis to an axial point on the image-side surface of the fourth lens element is denoted by SGI422. The following relations are satisfied: 0<SGI412/(SGI412+TP4)≤0.9 and 0<SGI422/(SGI422+TP4)≤0.9. Preferably, the following relations may be satisfied: 0.1≤SGI412/(SGI412+TP4)≤0.8 and 0.1≤SGI422/(SGI422+TP4)≤0.8.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fourth lens element which is nearest to the optical axis and the optical axis is denoted by HIF411. A distance perpendicular to the optical axis between an inflection point on the image-side surface of the fourth lens element which is nearest to the optical axis and an axial point on the image-side surface of the fourth lens element is denoted by HIF421. The following relations are satisfied: 0.01≤HIF411/HOI≤0.9 and 0.01≤HIF421/HOI≤0.9. Preferably, the following relations may be satisfied: 0.09≤HIF411/HOI≤0.5 and 0.09≤HIF421/HOI≤0.5.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fourth lens element which is the second nearest to the optical axis and the optical axis is denoted by HIF412. A distance perpendicular to the optical axis between an axial point on the image-side surface of the fourth lens element and an inflection point on the image-side surface of the fourth lens element which is the second nearest to the optical axis is denoted by HIF422. The following relations are satisfied: 0.01≤HIF412/HOI≤0.9 and 0.01≤HIF422/HOI≤0.9. Preferably, the following relations may be satisfied: 0.09≤HIF412/HOI≤0.8 and 0.09≤HIF422/HOI≤0.8.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fourth lens element which is the third nearest to the optical axis and the optical axis is denoted by HIF413. A distance perpendicular to the optical axis between an axial point on the image-side surface of the fourth lens element and an inflection point on the image-side surface of the fourth lens element which is the third nearest to the optical axis is denoted by HIF423. The following relations are satisfied: 0.001 mm≤|HIF413|≤5 mm and 0.001 mm≤|HIF423|≤5 mm. Preferably, the following relations may be satisfied: 0.1 mm≤|HIF423|≤3.5 mm and 0.1 mm≤|HIF413|≤13.5 mm.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fourth lens element which is the fourth nearest to the optical axis and the optical axis is denoted by HIF414. A distance perpendicular to the optical axis between an axial point on the image-side surface of the fourth lens element and an inflection point on the image-side surface of the fourth lens element which is the fourth nearest to the optical axis is denoted by HIF424. The following relations are satisfied: 0.001 mm≤|HIF414|≤5 mm and 0.001 mm≤|HIF424|≤5 mm. Preferably, the following relations may be satisfied: 0.1 mm≤|HIF424|≤3.5 mm and 0.1 mm≤|HIF414|≤3.5 mm.
In one embodiment of the optical image capturing system of the present disclosure, the chromatic aberration of the optical image capturing system can be corrected by alternatively arranging the lens elements with large Abbe number and small Abbe number.
The above Aspheric formula is:
z=ch2/[1+[1−(k+1)c2h2]0.5]+A4h4+A6h6+A8h8+A10h10+A12h12+A14h14+A16h16+A18h18+A20h20+ . . . (1),
where z is a position value of the position along the optical axis and at the height h which reference to the surface apex; k is the conic coefficient, c is the reciprocal of curvature radius, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 are high order aspheric coefficients.
The optical image capturing system provided by the disclosure, the lens elements may be made of glass or plastic material. If plastic material is adopted to produce the lens elements, the cost of manufacturing will be lowered effectively. If lens elements are made of glass, the heat effect can be controlled and the designed space arranged for the refractive power of the optical image capturing system can be increased. Besides, the object-side surface and the image-side surface of the first through fourth lens elements may be aspheric, so as to obtain more control variables. Comparing with the usage of traditional lens element made by glass, the number of lens elements used can be reduced and the aberration can be eliminated. Thus, the total height of the optical image capturing system can be reduced effectively.
In addition, in the optical image capturing system provided by the disclosure, if the lens element has a convex surface, the surface of the lens element is convex adjacent to the optical axis. If the lens element has a concave surface, the surface of the lens element is concave adjacent to the optical axis.
Besides, in the optical image capturing system of the disclosure, according to different requirements, at least one aperture may be arranged for reducing stray light and improving the imaging quality.
The optical image capturing system of the disclosure can be adapted to the optical image capturing system with automatic focus if required. With the features of a good aberration correction and a high quality of image formation, the optical image capturing system can be used in various application fields.
The optical image capturing system of the disclosure can include a driving module according to the actual requirements. The driving module may be coupled with the lens elements to enable the lens elements producing displacement. The driving module described above may be the voice coil motor (VCM) which is applied to move the lens to focus, or may be the optical image stabilization (OIS) which is applied to reduce the distortion frequency owing to the vibration of the lens while shooting.
At least one lens element among the first lens element, the second lens element, the third lens element and the fourth lens element of the optical image capturing system of the present disclosure may be a light filtration element which filters light with wavelength of less than 500 nm according to the actual requirements. The light filtration element may be made by coating film on at least one surface of the lens element with the specific filtration function or the lens element per se is designed with the material which is able to filter the short wavelength.
The image plane of the present invention may be a plane or a curved surface based on requirement. When the image plane is a curved surface, it reduces the accident angle the image plane needs to focus light. In addition to achieving reducing the length of the system, it also promotes the relative illumination.
In the optical image capturing system of the present invention, each object-side surface of each lens element may have a beating surface of object side depending on the requirement, and the image-side surface thereof has a bearing surface of image side. Depending on the requirement, the bearing surface of object side and the bearing surface of image side of each lens element may be respectively configured to be mutually inserted to the adjacent front lens element and the adjacent rear lens element via the contact surfaces thereof, so as to form a stacked structure. The length of the outline of the contact surface in the radial direction of the lens is denoted by BSL, which satisfies condition as follows: 0.01 mm≤BSL≤1 mm. In a preferred embodiment, condition as follows is satisfied: 0.05 mm≤BSL≤0.5 mm. In the most preferred embodiment, condition as follows is satisfied: 0.08 mm≤BSL≤0.2 mm.
In the optical image capturing system of the present invention, the stacked structure may be designed as a single-insertion structure based on requirement, e.g. the first lens element has a first bearing surface of image side on the image-side surface thereof, and the second lens element has a second bearing surface of object side on the object-side surface thereof, such that the second bearing surface of object side contacts with the first bearing surface of image side and both of them are inserted to each other. Alternatively, the stacked structure may be designed as a double-insertion structure, e.g. a double-insertion structure is provided on the basis of the single-insertion structure. The second lens element has a second bearing surface of image side, the third lens element has a third bearing surface of object side, and the third bearing surface of object side contacts with the second bearing surface of image side such that both of them are inserted to each other.
Alternatively, the structure can be a triple-insertion structure or a full-insertion structure. An optical image capturing system with seven-piece optical lenses, for example, is provided on the basis of double-insertion structure. The third lens element has a third bearing surface of image side on the image-side surface thereof, the fourth lens element has a fourth bearing surface of object side on the object-side surface thereof, and the fourth bearing surface of object side contacts with the third bearing surface of image side such that both of them are inserted to each other. The fourth lens element has a fourth bearing surface of image side on the image-side surface thereof, the fifth lens element has a fifth bearing surface of object side on the object-side surface thereof, and the fifth bearing surface of object side contacts with the fourth bearing surface of image side such that both of them are inserted to each other. The fifth lens element has a fifth bearing surface of image side on the image-side surface thereof, the sixth lens element has a sixth bearing surface of object side on the object-side surface thereof, and the sixth bearing surface of object side contacts with the fifth bearing surface of image side such that both of them are inserted to each other, The sixth lens element has a bearing surface of image side on the image-side surface thereof, the seventh lens element has a seventh bearing surface of object side on the object-side surface thereof, and the seventh bearing surface of object side contacts with the sixth bearing surface of image side such that both of them are inserted to each other.
Depending on the requirement, the extension lines of the first to seventh bearing surfaces of image side may be configured to extend toward the object side or the image plane and intersect with the optical axis to form angles IAG, which are denoted by IAG1, IAG2, IAG3, IAG4, IAG5, IAG6 and IAG7, respectively; condition as follows is satisfied: 0 deg<IAG≤90 deg. The values of the aforementioned angles IAG1 to IAG7 may vary in order to meet the practical requirement of the specification of the optical image capturing system. In a preferred embodiment, condition as follows may be imposed: 0 deg<IAG≤45 deg. In the best mode the following condition may be imposed: 0 deg<IAG≤30 deg and IAG1 to IAG7 are equivalent angles, i.e. IAG1=IAG2=IAG3=IAG4=IAG5=IAG6=IAG7.
Take the full-insertion structure of the aforementioned optical image capturing system with seven-piece lenses for example, the extension lines of the first to seventh bearing surfaces of object side may be configured to extend toward the object side or the image plane and intersect with the optical axis to form angles OAG, which are denoted by OAG1, OAG2, OAG3, OAG4, OAG5, OAG6 and OAG7, respectively; condition as follows is satisfied: 0 deg<OAG≤90 deg. The values of the aforementioned angles OAG1 to OAG7 may vary in order to meet the practical requirement of the specification of the optical image capturing system. In a preferred embodiment, condition as follows may be imposed: 0 deg<OAG≤45 deg. In the best mode, the following condition may be imposed: 0 deg<OAG≤30 deg and OAG1 to OAG7 are equivalent angles, i.e. OAG1=OAG2=OAG3=OAG4=OAG5=OAG6=OAG7.
Referring to
Referring to
According to the above embodiments, the specific embodiments with figures are presented in detail as below.
Please refer to
The first lens element 110 has negative refractive power and it is made of glass material. The first lens element 110 has a convex object-side surface 112 and a concave image-side surface 114, and both of the object-side surface 112 and the image-side surface 114 are aspheric. The length of outline curve of the maximum effective half diameter position of the object-side surface of the first lens element is denoted as ARS11. The length of outline curve of the maximum effective half diameter position of the image-side surface of the first lens element is denoted as ARS12. The length of outline curve of a half of an entrance pupil diameter (HEP) of the object-side surface of the first lens element is denoted as ARE11, and the length of outline curve of the half of the entrance pupil diameter (HEP) of the image-side surface of the first lens element is denoted as ARE12. The thickness of the first lens element on the optical axis is TP1.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the first lens element which is nearest to the optical axis to an axial point on the object-side surface of the first lens element is denoted by SGI111. A distance in parallel with an optical axis from an inflection point on the image-side surface of the first lens element which is nearest to the optical axis to an axial point on the image-side surface of the first lens element is denoted by SGI121. The following relations are satisfied: SGI111=0 mm, SGI121=0 mm, |SGI111|/(|SGI111|+TP1)=0 and |SGI121|/(|SGI121|+TP1)=0.
A distance perpendicular to the optical axis from the inflection point on the object-side surface of the first lens element which is nearest to the optical axis to an axial point on the object-side surface of the first lens element is denoted by HIF111. A distance perpendicular to the optical axis from the inflection point on the image-side surface of the first lens element which is nearest to the optical axis to an axial point on the image-side surface of the first lens element is denoted by HIF121. The following relations are satisfied: HIF111=0 mm, HIF121=0 mm, HIF111/HOI=0 and HIF121/HOI=0.
The second lens element 120 has positive refractive power and it is made of plastic material. The second lens element 120 has a concave object-side surface 122 and a convex image-side surface 124, and both of the object-side surface 122 and the image-side surface 124 are aspheric. The object-side surface 122 has an inflection point. The length of outline curve of the maximum effective half diameter position of the object-side surface of the second lens element is denoted as ARS21, and the length of outline curve of the maximum effective half diameter position of the image-side surface of the second lens element is denoted as ARS22. The length of outline curve of a half of an entrance pupil diameter (HEP) of the object-side surface of the second lens element is denoted as ARE21, and the length of outline curve of the half of the entrance pupil diameter (HEP) of the image-side surface of the second lens element is denoted as ARE22. The thickness of the second lens element on the optical axis is TP2.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the second lens element which is nearest to the optical axis to an axial point on the object-side surface of the second lens element is denoted by SGI211. A distance in parallel with an optical axis from an inflection point on the image-side surface of the second lens element which is nearest to the optical axis to an axial point on the image-side surface of the second lens element is denoted by SGI221. The following relations are satisfied: SGI211=−0.13283 mm and |SGI211|/(|SGI211|+TP2)=0.05045.
A distance perpendicular to the optical axis from the inflection point on the object-side surface of the second lens element which is nearest to the optical axis to an axial point on the object-side surface of the second lens element is denoted by HIF211. A distance perpendicular to the optical axis from the inflection point on the image-side surface of the second lens element which is nearest to the optical axis to an axial point on the image-side surface of the second lens element is denoted by HIF221. The following relations are satisfied: HIF211=2.10379 mm and HIF211/HOI=0.69478.
The third lens element 130 has negative refractive power and it is made of plastic material. The third lens element 130 has a concave object-side surface 132 and a concave image-side surface 134, and both of the object-side surface 132 and the image-side surface 134 are aspheric. The image-side surface 134 has an inflection point. The length of outline curve of the maximum effective half diameter position of the object-side surface of the third lens element is denoted as ARS31, and the length of outline curve of the maximum effective half diameter position of the image-side surface of the third lens element is denoted as ARS32. The length of outline curve of a half of an entrance pupil diameter (HEP) of the object-side surface of the third lens element is denoted as ARE31, and the length of outline curve of the half of the entrance pupil diameter (HEP) of the image-side surface of the third lens element is denoted as ARE32. The thickness of the third lens element on the optical axis is TP3.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the third lens element which is nearest to the optical axis to an axial point on the object-side surface of the third lens element is denoted by SGI311. A distance in parallel with an optical axis from an inflection point on the image-side surface of the third lens element which is nearest to the optical axis to an axial point on the image-side surface of the third lens element is denoted by SGI321. The following relations are satisfied: SGI321=0.01218 mm and |SGI321|/(|SGI321|+TP3)=0.03902.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the third lens element which is nearest to the optical axis and the optical axis is denoted by HIF311. A distance perpendicular to the optical axis from the inflection point on the image-side surface of the third lens element which is nearest to the optical axis to an axial point on the image-side surface of the third lens element is denoted by HIF321. The following relations are satisfied: HIF321=0.84373 mm and HIF321/HOI=0.27864.
The fourth lens element 140 has positive refractive power and it is made of plastic material. The fourth lens element 140 has a convex object-side surface 142 and a convex image-side surface 144, both of the object-side surface 142 and the image-side surface 144 are aspheric, and the image-side surface 144 has an inflection point. The length of outline curve of the maximum effective half diameter position of the object-side surface of the fourth lens element is denoted as ARS41, and the length of outline curve of the maximum effective half diameter position of the image-side surface of the fourth lens element is denoted as ARS42. The length of outline curve of a half of an entrance pupil diameter (HEP) of the object-side surface of the fourth lens element is denoted as ARE41, and the length of outline curve of the half of the entrance pupil diameter (HEP) of the image-side surface of the fourth lens element is denoted as ARS42. The thickness of the fourth lens element on the optical axis is TP4.
A distance in parallel with an optical axis from an inflection point on the object-side surface of the fourth lens element which is nearest to the optical axis to an axial point on the object-side surface of the fourth lens element is denoted by SGI411. A distance in parallel with an optical axis from an inflection point on the image-side surface of the fourth lens element which is nearest to the optical axis to an axial point on the image-side surface of the fourth lens element is denoted by SGI421. The following relations are satisfied: SGI411=0 mm, SGI421=−0.41627 mm, |SGI411|/(|SGI411|+TP4)=0 and |SGI421|/(|SGI421|+TP4)=0.25015.
A distance in parallel with the optical axis from an inflection point on the object-side surface of the fourth lens element which is the second nearest to the optical axis to an axial point on the object-side surface of the fourth lens element is denoted by SGI412. The following relations are satisfied: SGI412=0 mm and |SGI412|/(|SGI412|+TP4)=0.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fourth lens element which is nearest to the optical axis and the optical axis is denoted by HIF411. A distance perpendicular to the optical axis between the inflection point on the image-side surface of the fourth lens element which is nearest to the optical axis and the optical axis is denoted by HIF421. The following relations are satisfied: HIF411=0 mm, HIF421=1.55079 mm, HIF411/HOI=0 and HIF421/HOI=0.51215.
A distance perpendicular to the optical axis between the inflection point on the object-side surface of the fourth lens element which is the second nearest to the optical axis and the optical axis is denoted by HIF412. The following relations are satisfied: HIF412=0 mm and HIF412/HOI=0.
The IR-bandstop filter 170 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the fourth lens element 140 and the image plane 180.
In the optical image capturing system of the first embodiment, a focal length of the optical image capturing system is f, an entrance pupil diameter of the optical image capturing system is HEP, and half of a maximal view angle of the optical image capturing system is HAF. The detailed parameters are shown as below: f=2.6841 mm, f/HEP=2.7959, HAF=70° and tan(HAF)=2.7475.
In the optical image capturing system of the first embodiment, a focal length of the first lens element 110 is f1 and a focal length of the fourth lens element 140 is f4. The following relations are satisfied: f1=−5.4534 mm, |f/f1|=0.4922, f4=2.7595 mm and |f1/f4|=1.9762.
In the optical image capturing system of the first embodiment, focal lengths of the second lens element 120 and the third lens element 130 are f2 and f3, respectively. The following relations are satisfied: |f2|+|f3|=13.2561 mm, |f1|+|f4|=8.2129 mm and |f2|+|f3|>|f1|+|f4|.
A ratio of the focal length f of the optical image capturing system to a focal length fp of each of lens elements with positive refractive power is PPR. A ratio of the focal length f of the optical image capturing system to a focal length fn of each of lens elements with negative refractive power is NPR. In the optical image capturing system of the first embodiment, a sum of the PPR of all lens elements with positive refractive power is ΣPPR=|f/f2|+|f/f4|=1.25394. A sum of the NPR of all lens elements with negative refractive powers is ΣNPR=|f/f1|+|f/f2|=1.21490, ΣPPR/|ΣNPR|=1.03213. The following relations are also satisfied: |f/f1|=0.49218, |f/f2|=0.28128, |f/f3|=0.72273, and |f/f4|=0.97267.
In the optical image capturing system of the first embodiment, a distance from the object-side surface 112 of the first lens element to the image-side surface 144 of the fourth lens element is InTL. A distance from the object-side surface 112 of the first lens element to the image plane 180 is HOS. A distance from an aperture 100 to an image plane 180 is InS. Half of a diagonal length of an effective detection field of the image sensing device 190 is HOI. A distance from the image-side surface 144 of the fourth lens element to an image plane 180 is InB. The following relations are satisfied: InTL+InB=HOS, HOS=18.74760 mm, HOI=3.088 mm, HOS/HOI=6.19141, HOS/f=6.9848, InTL/HOS=0.6605, InS=8.2310 mm, and InS/HOS=0.4390
In the optical image capturing system of the first embodiment, the sum of central thicknesses of all lens elements with refractive power on the optical axis is ΣTP. The following relations are satisfied: ΣTP=4.9656 mm, and ΣTP/InTL=0.4010. Hereby, contrast ratio for the image formation in the optical image capturing system and defect-free rate for manufacturing the lens element can be given consideration simultaneously, and a proper back focal length is provided to dispose other optical components in the optical image capturing system.
In the optical image capturing system of the first embodiment, a curvature radius of the object-side surface 112 of the first lens element is R1. A curvature radius of the image-side surface 114 of the first lens element is R2. The following relation is satisfied: |R1/R2|=9.6100. Hereby, the first lens element may have proper strength of the positive refractive power, so as to avoid the longitudinal spherical aberration to increase too fast.
In the optical image capturing system of the first embodiment, a curvature radius of the object-side surface 142 of the fourth lens element is R7. A curvature radius of the image-side surface 144 of the fourth lens element is R8. The following relation is satisfied: (R7−R8)/(R7+R8)=−35.5932. Hereby, the astigmatism generated by the optical image capturing system can be corrected beneficially.
In the optical image capturing system of the first embodiment, a sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relations are satisfied: ΣPP=12.30183 mm and f4/ΣPP=0.22432. Hereby, it is favorable for allocating the positive refractive power of the fourth lens element 140 to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the first embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relations are satisfied: ΣNP=−14.6405 mm and f1/ΣNP=0.59488. Hereby, it is favorable for allocating the negative refractive power of the fourth lens element 140 to other negative lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the first embodiment, a distance between the first lens element 110 and the second lens element 120 on the optical axis is IN12. The following relations are satisfied: IN12=4.5709 mm and IN12/f=1.70299. Hereby, the chromatic aberration of the lens elements can be improved, such that the performance can be increased.
In the optical image capturing system of the first embodiment, a distance between the second lens element 120 and the third lens element 130 on the optical axis is IN23. The following relations are satisfied: IN23=2.7524 mm and IN23/f=1.02548. Hereby, the chromatic aberration of the lens elements can be improved, such that the performance can be increased.
In the optical image capturing system of the first embodiment, a distance between the third lens element 130 and the fourth lens element 140 on the optical axis is IN34. The following relations are satisfied: IN34=0.0944 mm and IN34/f=0.03517. Hereby, the chromatic aberration of the lens elements can be improved, such that the performance can be increased.
In the optical image capturing system of the first embodiment, central thicknesses of the first lens element 110 and the second lens element 120 on the optical axis are TP1 and TP2, respectively. The following relations are satisfied: TP1=0.9179 mm, TP2=2.5000 mm, TP1/TP2=0.36715 and (TP1+IN12)/TP2=2.19552. Hereby, the sensitivity produced by the optical image capturing system can be controlled, and the performance can be increased.
In the optical image capturing system of the first embodiment, central thicknesses of the third lens element 130 and the fourth lens element 140 on the optical axis are TP3 and TP4, respectively, and a distance between the aforementioned two lens elements on the optical axis is IN34. The following relations are satisfied: TP3=0.3 mm, TP4=1.2478 mm, TP3/TP4=0.24043 and (TP4+IN34)/TP3=4.47393. Hereby, the sensitivity produced by the optical image capturing system can be controlled and the total height of the optical image capturing system can be reduced.
In the optical image capturing system of the first embodiment, the following relations are satisfied: IN23/(TP2+IN23+TP3)=0.49572. Hereby, the aberration generated by the process of moving the incident light can be adjusted slightly layer upon layer, and the total height of the optical image capturing system can be reduced.
A distance in parallel with an optical axis from a maximum effective diameter position to an axial point on the object-side surface 142 of the fourth lens element is InRS41. A distance in parallel with an optical axis from a maximum effective diameter position to an axial point on the image-side surface 144 of the fourth lens element is InRS42. A central thickness of the fourth lens element 140 on the optical axis is TP4. The following relations are satisfied: InRS41=0.2955 mm, InRS42=−0.4940 mm, |InRS41|+|InRS42|=0.7894 mm, |InRS41|/TP4=0.23679 and |InRS42|/TP4=0.39590. Hereby, it is favorable to the manufacturing and formation of the lens elements and to maintain its miniaturization effectively.
In the optical image capturing system of the first embodiment, a distance perpendicular to the optical axis between a critical point C41 on the object-side surface 142 of the fourth lens element and the optical axis is HVT41. A distance perpendicular to the optical axis between a critical point C42 on the image-side surface 144 of the fourth lens element and the optical axis is HVT42. The following relations are satisfied: HVT41=0 mm and HVT42=0 mm.
In the optical image capturing system of the first embodiment, the following relation is satisfied: HVT42/HOI=0.
In the optical image capturing system of the first embodiment, the following relation is satisfied: HVT42/HOS=0.
In the optical image capturing system of the first embodiment, an Abbe number of the first lens element is NA1. An Abbe number of the second lens element is NA2. An Abbe number of the third lens element is NA3. An Abbe number of the fourth lens element is NA4. The following relations are satisfied: |NA1−NA2|=0.0351. Hereby, the chromatic aberration of the optical image capturing system can be corrected.
In the optical image capturing system of the first embodiment, TV distortion and optical distortion for image formation in the optical image capturing system are TDT and ODT, respectively. The following relations are satisfied: |TDT|=37.4846% and |ODT|=−55.3331%.
In the optical image capturing system of the first embodiment, a lateral aberration of the longest operation wavelength of a positive direction tangential fan of the optical image capturing system passing through an edge of the aperture and incident on the image plane by 0.7 view field is denoted as PLTA, which is −0.018 mm. A lateral aberration of the shortest operation wavelength of the positive direction tangential fan of the optical image capturing system passing through the edge of the aperture and incident on the image plane by 0.7 view field is denoted as PSTA, which is 0.010 mm. A lateral aberration of the longest operation wavelength of a negative direction tangential fan of the optical image capturing system passing through the edge of the aperture and incident on the image plane by 0.7 view field is denoted as NLTA, which is 0.003 mm. A lateral aberration of the shortest operation wavelength of a negative direction tangential fan of the optical image capturing system passing through the edge of the aperture and incident on the image plane by 0.7 view field is denoted as NSTA, which is −0.003 mm. A lateral aberration of the longest operation wavelength of a sagittal fan of the optical image capturing system passing through the edge of the aperture and incident on the image plane by 0.7 view field is denoted as SLTA, which is −0.010 mm. A lateral aberration of the shortest operation wavelength of the sagittal fan of the optical image capturing system passing through the edge of the aperture and incident on the image plane by 0.7 view field is denoted as SSTA, which is 0.003 mm.
In the present embodiment of the optical image capturing system, all of the bearing surfaces of image side and all of the bearing surfaces of object side of the lens elements are configured to extend toward the image plane and intersect with the optical axis to form angles, wherein the angles IAG1 to IAG2 and OAG2 to OAG3 are the same, and are set to 90 deg. The lens elements form a stacked structure via the contact surfaces thereof that mutually insert one lens element to another, the lengths of the outlines of all of the aforementioned contact surfaces in the radial direction of the lens are denoted by BSL, which satisfy the following conditions: BSL=0.1 mm.
Please refer to the following Table 1 and Table 2.
The detailed data of the optical image capturing system of the first embodiment is as shown in Table 1.
TABLE 1
Lens Parameters for the First Embodiment
f(focal length) = 2.6841 mm; f/HEP = 2.7959; HAF(half angle of view) = 70 deg;
tan(HAF) = 2.7475
Central
Surface
Thickness
Refractive
Abbe
Focal
No.
Curvature Radius
(mm)
Material
Index
No.
Length
0
Object
Plane
At
Infinity
1
Lens 1
31.98102785
0.918
Glass
1.688
50.26
−5.453
2
3.327880578
4.571
3
Lens 2
−15.2556818
2.500
Plastic
1.642
22.46
9.542
4
−4.681543531
2.528
5
Aperture
Plane
0.225
Stop
6
Lens 3
−2.453543123
0.300
Plastic
1.642
22.46
−3.714
7
127.8664454
0.094
8
Lens 4
2.697747363
1.248
Plastic
1.544
56.09
2.759
9
−2.853715061
0.725
10
IR-
Plane
2.000
BK7_
1.517
64.13
bandstop
SCHOTT
filter
11
Plane
3.640
12
Image
Plane
Plane
Reference Wavelength = 555 nm; Shielding Position: The 3rd surface with clear aperture of 3.0 mm
As for the parameters of the aspheric surfaces of the first embodiment, reference is made to Table 2.
TABLE 2
Aspheric Coefficients
Surface#
3
4
6
7
8
9
k=
−2.918829E+01
−3.214789E+00
−1.504539E+01
−2.970417E+01
−1.613370E+01
−1.145951E+00
A4=
−9.004096E−04
−9.725260E−06
8.890018E−05
3.634454E−02
9.587367E−03
−4.742020E−03
A6=
2.391364E−04
−8.096303E−05
−1.166688E−02
−3.060142E−02
−3.693991E−03
1.232422E−03
A8=
−2.421089E−05
7.787465E−07
−5.720942E−04
8.833265E−03
8.653836E−04
3.333400E−04
A10=
1.716292E−06
3.517517E−07
8.305770E−04
−1.362695E−03
−7.093620E−05
−2.583094E−06
A12=
0.000000E+00
0.000000E+00
0.000000E+00
0.000000E+00
0.000000E+00
0.000000E+00
The relevant data of the length of outline curve may be deduced from Table 1 and Table 2.
First embodiment (Primary reference wavelength: 555 nm)
ARE
1/2(HEP)
ARE value
ARE-1/2(HEP)
2(ARE/HEP) %
TP
ARE/TP (%)
11
0.480
0.480
0.000
100.00%
0.918
52.30%
12
0.480
0.482
0.002
100.35%
0.918
52.48%
21
0.480
0.480
0.000
100.02%
2.500
19.20%
22
0.480
0.481
0.001
100.17%
2.500
19.23%
31
0.480
0.482
0.002
100.49%
0.300
160.78%
32
0.480
0.480
0.000
100.00%
0.300
160.00%
41
0.480
0.482
0.002
100.42%
1.248
38.63%
42
0.480
0.482
0.002
100.47%
1.248
38.65%
ARS
EHD
ARS value
ARS-EHD
(ARS/EHD) %
TP
ARS/TP (%)
11
5.943
5.978
0.035
100.58%
0.918
651.27%
12
3.236
4.439
1.204
137.20%
0.918
483.66%
21
3.000
3.007
0.007
100.24%
2.500
120.29%
22
2.855
2.983
0.128
104.49%
2.500
119.33%
31
1.061
1.079
0.017
101.61%
0.300
359.54%
32
1.293
1.292
−0.001
99.95%
0.300
430.77%
41
1.642
1.676
0.034
102.06%
1.248
134.30%
42
1.767
1.859
0.092
105.21%
1.248
148.98%
Table 1 is the detailed structure data to the first embodiment in
Please refer to
The first lens element 210 has negative refractive power and it is made of plastic material. The first lens element 210 has a convex object-side surface 212 and a concave image-side surface 214, and both of the object-side surface 212 and the image-side surface 214 are aspheric and have an inflection point.
The second lens element 220 has positive refractive power and it is made of plastic material. The second lens element 220 has a convex object-side surface 222 and a convex image-side surface 224, and both of the object-side surface 222 and the image-side surface 224 are aspheric. The object-side surface 222 has an inflection point.
The third lens element 230 has positive refractive power and it is made of plastic material. The third lens element 230 has a concave object-side surface 232 and a convex image-side surface 234, and both of the object-side surface 232 and the image-side surface 234 are aspheric and have one inflection point.
The fourth lens element 240 has negative power and it is made of plastic material. The fourth lens element 240 has a convex object-side surface 242 and a concave image-side surface 244, and both of the object-side surface 242 and the image-side surface 244 are aspheric, and have an inflection point.
The IR-bandstop filter 270 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the fourth lens element 240 and the image plane 280.
In the optical image capturing system of the second embodiment, the second lens element 220 and the third lens element 230 are both positive lens elements and focal lengths of the second lens element 220 and the third lens element 230 are f2 and f3, respectively. A sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relation is satisfied: ΣPP=f2+f3. Hereby, it is favorable for allocating the positive refractive power of the third lens element 230 to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the second embodiment, focal lengths of the first lens element 210 and the fourth lens element 240 are f1 and f4, respectively. A sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relation is satisfied: ΣPP=f1+f4. Hereby, it is favorable for allocating the negative refractive power of the first lens element 210 to other negative lens elements.
Please refer to the following Table 3 and Table 4.
The detailed data of the optical image capturing system of the second embodiment is as the one shown in Table 3.
TABLE 3
Lens Parameters for the Second Embodiment
f(focal length) = 1.323 mm; f/HEP = 1.8; HAF(half angle of view) = 37.5 deg;
tan(HAF) = 0.7673
Central
Surface
Thickness
Refractive
Abbe
Focal
No.
Curvature Radius
(mm)
Material
Index
No.
Length
0
Object
Plane
At
Infinity
1
Lens 1
2.815155869
0.175
Plastic
1.515
56.55
−4.014
2
1.16843349
0.051
3
Aperture
Plane
0.066
Stop
4
Lens 2
0.599339272
0.450
Plastic
1.544
55.96
0.837
5
−1.411016917
0.133
6
Lens 3
−0.317760089
0.187
Plastic
1.642
22.46
5.004
7
−0.356324528
0.050
8
Lens 4
1.400960481
0.238
Plastic
1.642
22.46
−2.390
9
0.686143826
0.219
10
IR-
Plane
0.210
BK7_
1.517
64.13
bandstop
SCHOTT
filter
11
Plane
0.31
12
Image
Plane
Plane
Reference Wavelength = 555 nm; Shield Position: The 1st surface with clear aperture of 0.43 mm and the 5th surface with clear aperture of 0.390 mm
As for the parameters of the aspheric surfaces of the second embodiment, reference is made to Table 4.
TABLE 4
Aspheric Coefficients
Surface#
1
2
4
5
k=
−2.100896E+01
−3.117650E+01
−6.594072E−01
−5.749340E+00
A4=
−1.034815E+00
−1.247743E+00
−2.144582E+00
−5.564182E−01
A6=
−1.467293E+01
−3.933644E+01
−2.397809E+01
−5.601046E+01
A8=
4.846220E+02
1.049222E+03
1.466540E+03
7.715029E+02
A10=
−7.102825E+03
−1.234792E+04
−4.393327E+04
−8.580555E+03
A12=
5.884002E+04
5.356074E+04
7.002153E+05
6.735915E+04
A14=
−2.820526E+05
1.558329E+05
−6.248007E+06
−2.902619E+05
A16=
7.245452E+05
−2.134561E+06
2.912419E+07
5.267012E+05
A18=
−7.701193E+05
5.176547E+06
−5.535295E+07
−1.326747E+05
A20=
1.874256E+01
0.000000E+00
0.000000E+00
0.000000E+00
Surface#
6
7
8
9
k=
−1.293538E+00
−1.778968E+00
−9.958872E−02
−9.720777E+00
A4=
5.280891E+00
7.147752E+00
2.668792E+00
−6.993487E−01
A6=
−4.929357E+01
−1.152802E+02
−1.053723E+02
−9.822777E+00
A8=
−5.524670E+02
1.188148E+03
1.164018E+03
9.374187E+01
A10=
2.181848E+04
−6.205622E+03
−7.629138E+03
−4.377047E+02
A12=
−2.298819E+05
2.212051E+04
3.098893E+04
1.160682E+03
A14=
1.176507E+06
−6.949962E+04
−7.777603E+04
−1.720966E+03
A16=
−3.006163E+06
1.681686E+05
1.168351E+05
1.259258E+03
A18=
3.050941E+06
−1.906600E+05
−9.146103E+04
−3.228384E+02
A20=
0.000000E+00
0.000000E+00
0.000000E+00
0.000000E+00
In the second embodiment, the presentation of the aspheric surface formula is similar to that in the first embodiment. Besides, the definitions of parameters in following tables are equal to those in the first embodiment, so the repetitious details will not be given here.
The following contents may be deduced from Table 3 and Table 4.
Second embodiment (Primary reference wavelength = 555 nm)
InRS41
InRS42
HVT41
HVT42
ODT %
TDT %
−0.02448
−0.00545
0.30907
0.42296
1.30002
0.70606
|f/f1|
|f/f2|
|f/f3|
|f/f4|
|f1/f2|
|f2/f3|
0.32944
1.58025
0.26432
0.55346
4.79676
0.16726
ΣPPR
ΣNPR
ΣPPR/|ENPR|
ΣPP
ΣNP
f1/ΣPP
1.84456
0.88290
2.08922
5.84043
−6.40396
−0.68735
f4/ΣNP
IN12/f
IN23/f
IN34/f
TP3/f
TP4/f
0.37314
0.08827
0.10034
0.03781
0.14140
0.18018
InTL
HOS
HOS/HOI
InS/HOS
InTL/HOS
ΣTP/InTL
1.34974
2.08923
2.03232
0.89196
0.64605
0.77815
(TP1 + IN12)/TP2
(TP4 + IN34)/TP3
TP1/TP2
TP3/TP4
IN23/(TP2 + IN23 + TP3)
0.64830
1.54164
0.38889
0.78476
0.17240
|InRS41|/TP4
|InRS42|/TP4
HVT42/HOI
HVT42/HOS
0.1027
0.0229
0.4114
0.2024
IAG1-IAG4
OAG1-OAG4
BSL
19
deg
19
deg
0.08
mm
PSTA
PLTA
NSTA
NLTA
SSTA
SLTA
0.001
mm
0.001
mm
0.018
mm
0.012 mm
−0.002 mm
0.001 mm
The following contents may be deduced from Table 3 and Table 4.
Related Inflection Point Values of the Second Embodiment (Primary reference wavelength: 555 nm)
HIF111
0.1522
HIF111/HOI
0.1481
SGI111
0.0034
| SGI111 |/( | SGI111 | + TP1)
0.0192
HIF121
0.1456
HIF121/HOI
0.1417
SGI121
0.0074
| SGI121 |/( | SGI121 | + TP1)
0.0408
HIF211
0.2328
HIF211/HOI
0.2264
SGI211
0.0389
| SGI211 |/( | SGI211 | + TP2)
0.0796
HIF311
0.2617
HIF311/HOI
0.2546
SGI311
−0.0900
| SGI311 |/( | SGI311 | + TP3)
0.3249
HIF321
0.2495
HIF321/HOI
0.2427
SGI321
−0.0673
| SGI321 |/( | SGI321 | + TP3)
0.2646
HIF411
0.1827
HIF411/HOI
0.1778
SGI411
0.0122
| SGI411 |/( | SGI411 | + TP4)
0.0486
HIF421
0.2076
HIF421/HOI
0.2020
SGI421
0.0250
| SGI421 |/( | SGI421 | + TP4)
0.0950
The relevant data of the length of outline curve may be deduced from Table 3 and Table 4.
Second embodiment (Primary reference wavelength: 555 nm)
ARE
1/2(HEP)
ARE value
ARE-1/2(HEP)
2(ARE/HEP) %
TP
ARE/TP (%)
11
0.367
0.367
−0.00021
99.94%
0.175
209.80%
12
0.367
0.368
0.00053
100.14%
0.175
210.22%
21
0.363
0.369
0.00589
101.62%
0.450
81.92%
22
0.367
0.387
0.01919
105.22%
0.450
85.90%
31
0.367
0.398
0.03014
108.20%
0.187
212.56%
32
0.367
0.384
0.01694
104.61%
0.187
205.51%
41
0.367
0.368
0.00075
100.20%
0.238
154.48%
42
0.367
0.371
0.00333
100.91%
0.238
155.56%
ARS
EHD
ARS value
ARS-EHD
(ARS/EHD) %
TP
ARS/TP (%)
11
0.430
0.430
−0.00027
99.94%
0.175
245.56%
12
0.393
0.395
0.00137
100.35%
0.175
225.46%
21
0.363
0.369
0.00589
101.62%
0.450
81.92%
22
0.390
0.415
0.02497
106.40%
0.450
92.22%
31
0.402
0.433
0.03104
107.71%
0.187
231.77%
32
0.433
0.452
0.01854
104.28%
0.187
241.65%
41
0.503
0.519
0.01623
103.23%
0.238
217.83%
42
0.697
0.732
0.03446
104.94%
0.238
307.07%
Please refer to
The first lens element 310 has positive refractive power and it is made of plastic material. The first lens element 310 has a convex object-side surface 312 and a concave image-side surface 314, and both of the object-side surface 312 and the image-side surface 314 are aspheric and have one inflection point.
The second lens element 320 has positive refractive power and it is made of plastic material. The second lens element 320 has a convex object-side surface 322 and a convex image-side surface 324, and both of the object-side surface 322 and the image-side surface 324 are aspheric and have one inflection point.
The third lens element 330 has positive refractive power and it is made of plastic material. The third lens element 330 has a concave object-side surface 332 and a convex image-side surface 334, and both of the object-side surface 332 and the image-side surface 334 are aspheric and have an inflection point.
The fourth lens element 340 has negative refractive power and it is made of plastic material. The fourth lens element 340 has a convex object-side surface 342 and a concave image-side surface 344, and both of the object-side surface 342 and the image-side surface 344 are aspheric and have an inflection point.
The IR-bandstop filter 370 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the fourth lens element 340 and the image plane 380.
In the optical image capturing system of the third embodiment, the first lens element, the second lens element 320 and the third lens element 330 are both positive lens elements and focal lengths thereof are f1, f2 and f3, respectively. A sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relation is satisfied: ΣPP=f1+f2+f3. Hereby, it is favorable for allocating the positive refractive power of the third lens element 330 to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the second embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relation is satisfied: ΣNP=f4. Hereby, it is favorable for allocating the negative refractive power of the first lens element 310 to other negative lens elements.
Please refer to the following Table 5 and Table 6.
The detailed data of the optical image capturing system of the third embodiment is as shown in Table 5.
TABLE 5
Lens Paremeters for the Third Embodiment
f(focal length) = 1.3310 mm; f/HEP = 2.0; HAF(half angle view) = 37.5170 deg;
tan(HAF) = 0.7678
Central
Surface
Thickness
Refractive
Abbe
Focal
No.
Curvature Radius
(mm)
Material
Index
No.
Length
0
Object
Plane
At
Infinity
1
Lens 1
0.83935305
0.175
Plastic
1.584
29.88
238.535
2
0.779262354
0.085
3
Aperture
Plane
0.050
Stop
4
Lens 2
0.623234619
0.285
Plastic
1.545
55.96
1.089
5
−11.00170615
0.123
6
Lens 3
−0.364938387
0.175
Plastic
1.642
22.46
10.040
7
−0.410676892
0.050
8
Lens 4
1.0692297
0.175
Plastic
1.642
22.46
−7.515
9
0.820249597
0.138
10
IR-
Plane
0.210
BK7_
1.517
64.13
bandstop
SCHOTT
Filter
11
Plane
0.442
12
Image
Plane
Plane
Reference Wavelength = 555 nm; Shield Position: The 1st surface with clear aperture of 0.370 mm and the 5th surface with clear aperture of 0.350 mm
As for the parameters of the aspheric surfaces of the third embodiment, reference is made to Table 6.
TABLE 6
Aspheric Coefficients
Surface
#
1
2
4
5
k =
−1.559670E+01
−3.285895E+01
−3.283737E−01
−2.715604E+01
A4 =
2.960488E+00
5.065976E+00
−7.176660E−01
3.614461E−01
A6 =
−8.781953E+01
−1.155499E+02
−5.059534E+01
−7.045897E+01
A8 =
2.168917E+03
1.873961E+02
2.209574E+03
1.490315E+03
A10 =
−3.808808E+04
4.119672E+04
−6.239210E+04
−2.783463E+04
A12 =
4.172494E+05
−9.858251E+05
9.875788E+05
2.549608E+05
A14 =
−2.731712E+06
1.068435E+07
−9.081709E+06
−1.110874E+06
A16 =
9.752197E+06
−5.730864E+07
4.401602E+07
2.625091E+06
A18 =
−1.459442E+07
1.229646E+08
−8.582584E+07
−4.104192E+06
A20 =
1.874089E+01
0.000000E+00
0.000000E+00
0.000000E+00
Surface
#
6
7
8
9
k =
−1.097425E+00
−1.384866E+00
−9.000000E+01
−1.042971E+01
A4 =
2.214305E+00
−4.780890E+00
−5.438650E+00
−5.344102E+00
A6 =
−8.731178E+01
1.414294E+02
9.066051E+01
5.295146E+01
A8 =
2.841182E+03
−1.711255E+03
−1.364068E+03
−4.481013E+02
A10 =
−5.162307E+04
9.272611E+03
1.266697E+04
2.489477E+03
A12 =
5.492447E+05
4.055356E+04
−7.011162E+04
−8.594433E+03
A14 =
−3.054910E+06
−7.073760E+05
2.041429E+05
1.680325E+04
A16 =
7.919499E+06
2.992540E+06
−2.001005E+05
−1.520673E+04
A18 =
−6.822180E+06
−4.349295E+06
−1.771508E+05
2.609779E+03
A20 =
0.000000E+00
0.000000E+00
0.000000E+00
0.000000E+00
The presentation of the aspheric surface formula in the third embodiment is similar to that in the first embodiment. Besides, the definitions of parameters in following tables are equal to those in the first embodiment so the repetitious details will not be given here.
The following contents may be deduced from Table 5 and Table 6.
Third embodiment (Primary reference wavelength: 555 nm)
InRS41
InRS42
HVT41
HVT42
ODT %
TDT %
−0.06700
−0.09200
0.20300
0.29700
1.30000
0.60800
|f/f1|
|f/f2|
|f/f3|
|f/f4|
|f1/f2|
|f2/f3|
0.00558
1.22222
0.13257
0.17711
219.04040
0.10847
ΣPPR
ΣNPR
ΣPPR/|ENPR|
ΣPP
ΣNP
f1/ΣPP
1.36037
0.17711
7.68084
249.66400
−7.51500
0.95542
f4/ΣNP
IN12/f
IN23/f
IN34/f
TP3/f
TP4/f
−0.14491
0.10143
0.09241
0.03757
0.13148
0.13148
InTL
HOS
HOS/HOI
InS/HOS
InTL/HOS
ΣTP/InTL
1.11700
1.90700
1.85506
0.86418
0.58574
0.72516
(TP1 + IN12)/TP2
(TP4 + IN34)/TP3
TP1/TP2
TP3/TP4
IN23/(TP2 + IN23 + TP3)
1.08772
1.28571
0.61404
1.00000
0.21098
|InRS41|/TP4
|InRS42|/TP4
HVT42/HOI
HVT42/HOS
0.3829
0.5257
0.2889
0.1557
IAG1-IAG4
OAG1-OAG4
BSL
25
deg
25
deg
0.01
mm
PSTA
PLTA
NSTA
NLTA
SSTA
SLTA
0.002
mm
0.008
mm
0.010
mm
0.003 mm
0.004 mm
0.004 mm
The relevant data of the length of outline curve may be deduced from Table 5 and Table 6.
Related Inflection Point Values of the Third Embodiment (Primary reference wavelength: 555 nm)
HIF111
0.2660
HIF111/HOI
0.2588
SGI111
0.0370
| SGI111 |/(| SGI111 | + TP1)
0.1745
HIF121
0.1940
HIF121/HOI
0.1887
SGI121
0.0200
| SGI121 |/(| SGI121 | + TP1)
0.1026
HIF211
0.2270
HIF211/HOI
0.2208
SGI211
0.0380
| SGI211 |/(| SGI211 | + TP2)
0.1176
HIF221
0.3430
HIF221/HOI
0.3337
SGI221
−0.0490
| SGI221 |/(| SGI221 | + TP2)
0.1467
HIF311
0.2590
HIF311/HOI
0.2519
SGI311
−0.0860
| SGI311 |/(| SGI311 | + TP3)
0.3295
HIF321
0.2470
HIF321/HOI
0.2403
SGI321
−0 .0730
| SGI321 |/(| SGI321 | + TP3)
0.2944
HIF411
0.0950
HIF411/HOI
0.0924
SGI411
0.0030
| SGI411 |/(| SGI411 | + TP4)
0.0169
HIF421
0.1440
HIF421/HOI
0.1401
SGI421
0.0100
| SGI421 |/(| SGI421 | + TP4)
0.0541
The relevant data of the length of outline curve may be deduced from Table 5 and Table 6.
Third embodiment (Primary reference wavelength: 555 nm)
ARE
ARE-
2(ARE/HEP)
ARE/TP
ARE
1/2(HEP)
value
1/2(HEP)
%
TP
(%)
11
0.333
0.337
0.00406
101.22%
0.175
192.42%
12
0.333
0.334
0.00166
100.50%
0.175
191.05%
21
0.329
0.335
0.00624
101.90%
0.285
117.73%
22
0.333
0.339
0.00628
101.89%
0.285
119.01%
31
0.333
0.358
0.02516
107.56%
0.175
204.48%
32
0.333
0.353
0.02042
106.14%
0.175
201.77%
41
0.333
0.333
0.00028
100.08%
0.175
190.26%
42
0.333
0.333
0.00021
100.06%
0.175
190.22%
ARS
ARS-
(ARS/EHD)
ARS/TP
ARS
EHD
value
EHD
%
TP
(%)
11
0.370
0.374
0.004
101.14%
0.175
213.83%
12
0.335
0.337
0.002
100.66%
0.175
192.77%
21
0.329
0.335
0.006
101.90%
0.285
117.73%
22
0.350
0.358
0.008
102.36%
0.285
125.79%
31
0.366
0.392
0.026
107.17%
0.175
224.16%
32
0.401
0.423
0.022
105.49%
0.175
241.46%
41
0.463
0.488
0.026
105.55%
0.175
278.99%
42
0.601
0.660
0.060
109.93%
0.175
377.37%
Please refer to
The first lens element 410 has positive refractive power and it is made of plastic material. The first lens element 410 has a convex object-side surface 412 and a concave image-side surface 414, and both of the object-side surface 412 and the image-side surface 414 are aspheric and have one inflection point.
The second lens element 420 has positive refractive power and it is made of plastic material. The second lens element 420 has a convex object-side surface 422 and a convex image-side surface 424, and both of the object-side surface 422 and the image-side surface 424 are aspheric. The object-side surface 422 has one inflection point.
The third lens element 430 has negative refractive power and it is made of plastic material. The third lens element 430 has a concave object-side surface 432 and a convex image-side surface 434, and both of the object-side surface 432 and the image-side surface 434 are aspheric and have an inflection point.
The fourth lens element 440 has positive refractive power and it is made of plastic material. The fourth lens element 440 has a concave object-side surface 442 and a convex image-side surface 444, and both of the object-side surface 442 and the image-side surface 444 are aspheric and have one inflection point.
The IR-bandstop filter 470 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the fourth lens element 440 and the image plane 480.
In the optical image capturing system of the fourth embodiment, the first lens element 410, the second lens element 420 and the fourth lens element 440 are both positive lens elements and focal lengths thereof are f1, f2 and f4, respectively. A sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relation is satisfied: ΣPP=f1+f2+f4. Hereby, it is favorable for allocating the positive refractive power of the third lens element 440 to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the fourth embodiment, a sum of focal length of the third lens elements with negative refractive power is ΣNP. The following relation is satisfied: ΣNP=f3. Hereby, it is favorable for allocating the negative refractive power of the first lens element 430 to other negative lens elements.
Please refer to the following Table 7 and Table 8.
The detailed data of the optical image capturing system of the fourth embodiment is as shown in Table 7.
TABLE 7
Lens Parameters of the Fourth Embodiment
f = 1.3290 mm; f/HEP = 2.0; HAF = 37.5150 deg; tan(HAF) = 0.7677
Surface
Thickness
Refractive
Focal
#
Curvature Radius
(mm)
Material
Index
Abbe #
length
0
Object
Plano
At
infinity
1
Lens 1
0.796358327
0.175
Plastic
1.584
29.88
47.93
2
0.752894203
0.095
3
Ape. Stop
Plano
0.050
4
Lens 2
0.69002414
0.289
Plastic
1.545
55.96
1.14
5
−5.470145447
0.127
6
Lens 3
−0.375226684
0.175
Plastic
1.642
22.46
−7.54
7
−0.480949837
0.050
8
Lens 4
0.634776701
0.175
Plastic
1.642
22.46
9.92
9
0.628050498
0.130
10
IR-band
Plano
0.210
BK7_
1.517
64.13
stop filter
SCHOTT
11
Plano
0.446
12
Image
Plano
plane
Reference wavelength = 555 nm, shield position: first surface with clear aperture of 0.390 mm, and the fifth surface with clear aperture (CA) of 0.350 mm
As for the parameters of the aspheric surfaces of the fourth embodiment, reference is made to Table 8.
TABLE 8
Aspheric Coefficients
Surface#
1
2
4
5
k =
−1.559070E+01
−3.277696E+01
−1.338964E−01
−2.644155E+01
A4 =
3.931058E+00
6.407587E+00
−7.455663E−01
−3.112638E−01
A6 =
−1.040453E+02
−1.208225E+02
−4.905075E+01
−7.316173E+01
A8 =
2.548788E+03
−4.252993E+01
2.152711E+03
1.536768E+03
A10 =
−4.367449E+04
4.938506E+04
−6.180943E+04
−3.005936E+04
A12 =
4.647813E+05
−1.098966E+06
9.823348E+05
3.189116E+05
A14 =
−2.944070E+06
1.140707E+07
−9.044375E+06
−1.714189E+06
A16 =
1.013712E+07
−5.908647E+07
4.382259E+07
4.420446E+06
A18 =
−1.459442E+07
1.229646E+08
−8.582584E+07
−4.104192E+06
A20 =
1.874407E+01
0.000000E+00
0.000000E+00
0.000000E+00
Surface#
6
7
8
9
k =
−9.444825E−01
−8.569895E−01
−2.727253E+01
−1.028315E+01
A4 =
1.474769E+00
−7.584700E+00
−4.999799E+00
−3.743632E+00
A6 =
−2.913984E+01
2.026719E+02
6.751631E+01
2.859772E+01
A8 =
1.861605E+02
−2.697091E+03
−9.280684E+02
−2.281186E+02
A10 =
−1.107176E+03
1.921504E+04
7.954824E+03
1.278101E+03
A12 =
8.405416E+04
−1.663989E+04
−3.875688E+04
−4.522034E+03
A14 =
−9.804138E+05
−5.393357E+05
8.940373E+04
9.165264E+03
A16 =
4.316120E+06
2.803448E+06
−2.453740E+04
−9.062636E+03
A18 =
−6.822180E+06
−4.349295E+06
−1.771508E+05
2.609779E+03
A20 =
0.000000E+00
0.000000E+00
0.000000E+00
0.000000E+00
The presentation of the aspheric surface formula in the fourth embodiment is similar to that in the first embodiment. Besides the definitions of parameters in following tables are equal to those in the first embodiment so the repetitious details will not be given here.
The following contents may be deduced from Table 7 and Table 8.
Fourth Embodiment (Primary reference wavelength: 555 nm)
InRS41
InRS42
HVT41
HVT42
ODT %
TDT %
−0.04300
−0.06200
0.26100
0.34000
1.30500
0.49200
|f/f1|
|f/f2|
|f/f3|
|f/f4|
|f1/f2|
|f2/f3|
0.02773
1.16477
0.17617
0.13399
42.00876
0.15125
ΣPPR
ΣNPR
ΣPPR/|ENPR|
ΣPP
ΣNP
f1/ΣPP
1.32648
0.17617
7.52969
58.99200
−7.54400
0.81252
f4/ΣNP
IN12/f
IN23/f
IN34/f
TP3/f
TP4/f
−0.15125
0.10910
0.09556
0.03762
0.13168
0.13168
InTL
HOS
HOS/HOI
InS/HOS
InTL/HOS
ΣTP/InTL
1.13600
1.92300
1.87062
0.85959
0.59074
0.71655
(TP1 + IN12)/TP2
(TP4 + IN34)/TP3
TP1/TP2
TP3/TP4
IN23/(TP2 + IN23 + TP3)
1.10727
1.28571
0.60554
1.00000
0.21489
|InRS41|/TP4
|InRS42|/TP4
HVT42/HOI
HVT42/HOS
0.2457
0.3543
0.3307
0.1768
IAG1-IAG4
OAG1-OAG4
BSL
25
deg
25
deg
0.01
mm
PSTA
PLTA
NSTA
NLTA
SSTA
SLTA
0.00007
mm
0.004
mm
0.008
mm
−0.00001 mm
0.005 mm
0.005 mm
The following contents may be deduced from Table 7 and Table 8.
Related Inflection Point Values of the Fourth Embodiment (Primary reference wavelength: 555 nm)
HIF111
0.3010
HIF111/HOI
0.2928
SGI111
0.0510
| SGI111 |/(| SGI111 | + TP1)
0.2257
HIF121
0.2200
HIF121/HOI
0.2140
SGI121
0.0280
| SGI121 |/(| SGI121 | + TP1)
0.1379
HIF211
0.2190
HIF211/HOI
0.2130
SGI211
0.0320
| SGI211 |/(| SGI211 | + TP2)
0.0997
HIF311
0.2600
HIF311/HOI
0.2529
SGI311
−0.0870
| SGI311 |/(| SGI311 | + TP3)
0.3321
HIF321
0.2570
HIF321/HOI
0.2500
SGI321
−0.0750
| SGI321 |/(| SGI321 | + TP3)
0.3000
HIF411
0.1210
HIF411/HOI
0.1177
SGI411
0.0090
| SGI411 |/(| SGI411 | + TP4)
0.0489
HIF421
0.1620
HIF421/HOI
0.1576
SGI421
0.0160
| SGI421 |/(| SGI421 | + TP4)
0.0838
The relevant data of the length of outline curve may be deduced from Table 7 and Table 8.
Fourth Embodiment (Primary Reference Wavelength 555 nm)
ARE
ARE-
2(ARE/HEP)
ARE/TP
ARE
1/2(HEP)
value
1/2(HEP)
%
TP
(%)
11
0.332
0.339
0.00620
101.87%
0.175
193.46%
12
0.332
0.336
0.00327
100.98%
0.175
191.78%
21
0.321
0.326
0.00425
101.32%
0.289
112.60%
22
0.332
0.342
0.00955
102.87%
0.289
118.23%
31
0.332
0.360
0.02753
108.28%
0.175
205.65%
32
0.332
0.353
0.02089
106.28%
0.175
201.85%
41
0.332
0.333
0.00065
100.20%
0.175
190.29%
42
0.332
0.334
0.00172
100.52%
0.175
190.90%
ARS
ARS-
(ARS/EHD)
ARS/TP
ARS
EHD
value
EHD
%
TP
(%)
11
0.390
0.397
0.007
101,82%
0.175
226.92%
12
0.338
0.341
0.003
100.82%
0.175
194.64%
21
0.321
0.326
0.004
101.32%
0.289
112.60%
22
0.350
0.362
0.012
103.55%
0.289
125.32%
31
0.368
0.397
0.029
107.80%
0.175
226.72%
32
0.407
0,429
0.022
105.43%
0.175
244.96%
41
0.486
0.511
0.025
105.08%
0.175
291.94%
42
0.625
0.683
0.057
109.17%
0.175
390.18%
Please refer to
The first lens element 510 has positive refractive power and it is made of plastic material. The first lens element 510 has a convex object-side surface 512 and a concave image-side surface 514, and both of the object-side surface 512 and the image-side surface 514 are aspheric and have one inflection.
The second lens element 520 has positive refractive power and it is made of plastic material. The second lens element 520 has a convex object-side surface 522 and a convex image-side surface 524, and both of the object-side surface 522 and the image-side surface 524 are aspheric. The object-side surface 522 has one inflection point.
The third lens element 530 has positive refractive power and it is made of plastic material. The third lens element 530 has a concave object-side surface 532 and a convex image-side surface 534, and both of the object-side surface 532 and the image-side surface 534 are aspheric and have an inflection point.
The fourth lens element 540 has negative refractive power and it is made of plastic material. The fourth lens element 540 has a convex object-side surface 542 and a concave image-side surface 544, and both of the object-side surface 542 and the image-side surface 544 are aspheric and have an inflection point.
The IR-bandstop filter 570 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the fourth lens element 540 and the image plane 580.
In the optical image capturing system of the fifth embodiment, focal lengths of the first lens element 510, the second lens element 520, and the third lens element 530 are f1, f2, and f3, respectively. A sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relation is satisfied: ΣPP=f1+f2+f3. Hereby, it is favorable for allocating the positive refractive power of the fourth lens element 540 to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the fifth embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relation is satisfied: ΣNP=44. Hereby, it is favorable for allocating the negative refractive power of the first lens element 510 to other negative lens elements.
Please refer to the following Table 9 and Table 10.
The detailed data of the optical image capturing system of the fifth embodiment is as shown in Table 9.
TABLE 9
Lens Parameters of the Fifth Embodiment
f = 1.3290 mm; f/HEP = 2.0; HAF = 37.5120 deg; tan(HAF) = 0.7677
Thickness
Refractive
Focal
Surface#
Curvature Radius
(mm)
Material
Index
Abbe #
length
0
Object
Plano
At infinity
1
Lens 1
0.764838324
0.175
Plastic
1.584
29.88
32.549
2
0.729251375
0.105
3
Ape. Stop
Plano
0.050
4
Lens 2
0.770395463
0.297
Plastic
1.545
55.96
1.164
5
−3.142770862
0.142
6
Lens 3
−0.364018853
0.175
Plastic
1.642
22.46
10.785
7
−0.411367225
0.050
8
Lens 4
0.704534047
0.175
Plastic
1.642
22.46
−8.882
9
0.566378176
0.133
10
IR-bandstop
Plano
0.210
BK_7
1.517
64.13
filter
11
Plano
0.426
12
Image plane
Plano
0.000
Reference wavelength = 555 nm; shielding position = The 1st surface with clear aperture of 0.400 mm and the 5th surface with clear aperture of 0.350 mm
As for the parameters of the aspheric surfaces of the fifth embodiment, reference is made to Table 10.
TABLE 10
Aspheric Coefficients
Surface
#
1
2
4
5
k =
−1.556135E+01
−3.280664E+01
−3.827055E−01
−2.644155E+01
A4 =
4.702703E+00
7.815202E+00
−7.484692E−01
−1.194821E+00
A6 =
−1.160799E+02
−1.393947E+02
−3.722463E+01
−5.746811E+01
A8 =
2.832783E+03
2.293905E+02
1.632621E+03
1.097333E+03
A10 =
−4.795248E+04
4.713187E+04
−5.067966E+04
−2.273134E+04
A12 =
5.017520E+05
−1.090364E+06
8.450075E+05
2.609284E+05
A14 =
−3.109684E+06
1.139193E+07
−8.139072E+06
−1.526369E+06
A16 =
1.043435E+07
−5.906522E+07
4.116555E+07
4.236962E+06
A18 =
−1.459442E+07
1.229646E+08
−8.582584E+07
−4.104192E+06
A20 =
1.874596E+01
0.000000E+00
0.000000E+00
0.000000E+00
Surface
#
6
7
8
9
k =
−9.330802E−01
−1.025218E+00
−3.602467E+01
−1.030472E+01
A4 =
2.840791E−01
−4.611834E+00
−2.350703E+00
−2.912683E+00
A6 =
2.103726E+01
1.376837E+02
1.381331E+01
1.830157E+01
A8 =
−1.663331E+03
−1.900876E+03
−2.230149E+02
−1.401876E+02
A10 =
3.161881E+04
1.231873E+04
1.983758E+03
7.950709E+02
A12 =
−2.054994E+05
2.342849E+04
−7.402581E+03
−2.878355E+03
A14 =
2.733846E+05
−6.727018E+05
−2.462934E+03
6.062118E+03
A16 =
2.190178E+06
2.990921E+06
9.002743E+04
−6.575243E+03
A18 =
−6.822180E+06
−4.349295E+06
−1.771508E+05
2.609779E+03
A20 =
0.000000E+00
0.000000E+00
0.000000E+00
0.000000E+00
The presentation of the aspheric surface formula in the fifth embodiment is similar to that in the first embodiment. Besides the definitions of parameters in following tables are equal to those in the first embodiment so the repetitious details will not be given here.
The following contents may be deduced from Table 9 and Table 10.
Fifth embodiment (Primary reference wavelength: 555 nm)
InRS41
InRS42
HVT41
HVT42
ODT %
TDT %
−0.04100
−0.04600
0.27400
0.36500
1.30000
0.44600
|f/f1|
|f/f2|
|f/f3|
|f/f4|
|f1/f2|
|f2/f3|
0.04083
1.14175
0.12323
0.14963
27.96306
0.10793
ΣPPR
ΣNPR
ΣPPR/|ENPR|
ΣPP
ΣNP
f1/ΣPP
1.30581
0.14963
8.72702
44.49800
−8.88200
0.73147
f4/ΣNP
IN12/f
IN23/f
IN34/f
TP3/f
TP4/f
1.00000
0.11663
0.10685
0.03762
0.13168
0.13168
InTL
HOS
HOS/HOI
InS/HOS
InTL/HOS
ΣTP/InTL
1.16800
1.93700
1.88424
0.85545
0.60299
0.70377
(TP1 + IN12)/TP2
(TP4 + IN34)/TP3
TP1/TP2
TP3/TP4
IN23/(TP2 + IN23 + TP3)
1.11111
1.28571
0.58923
1.00000
0.23127
|InRS41|/TP4
|InRS42|/TP4
HVT42/HOI
HVT42/HOS
0.2343
0.2629
0.3551
0.1884
IAG1-IAG4
OAG1-OAG4
BSL
25
deg
25
deg
0.01
mm
PSTA
PLTA
NSTA
NLTA
SSTA
SLTA
0.00019
mm
0.001
mm
−0.007
mm
−0.016 mm
0.003 mm
0.005 mm
The following contents may be deduced from Table 9 and Table 10.
Related inflection point values of fifth embodiment (Primary reference wavelength: 555 nm)
HIF111
0.3250
HIF111/HOI
0.3161
SGI111
0.0640
| SGI111 |/(| SGI111 | + TP1)
0.2678
HIF121
0.2410
HIF121/HOI
0.2344
SGI121
0.0350
| SGI121 |/(| SGI121 | + TP1)
0.1667
HIF211
0.2080
HIF211/HOI
0.2023
SGI211
0.0260
| SGI211 |/(| SGI211 | + TP2)
0.0805
HIF311
0.2620
HIF311/HOI
0.2549
SGI311
−0.0950
| SGI311 |/(| SGI311 | + TP3)
0.3519
HIF321
0.2640
HIF321/HOI
0.2568
SGI321
−0.0860
| SGI321 |/(| SGI321 | + TP3)
0.3295
HIF411
0.1330
HIF411/HOI
0.1294
SGI411
0.0090
| SGI411 |/(| SGI411 | + TP4)
0.0489
HIF421
0.1710
HIF421/HOI
0.1663
SGI421
0.0200
| SGI421 |/(| SGI421 | + TP4)
0.1026
The relevant data of the length of outline curve may be deduced from Table 9 and Table 10.
Fifth embodiment (Primary reference wavelength: 555 nm)
ARE
ARE-
2(ARE/HEP)
ARE/TP
ARE
1/2(HEP)
value
1/2(HEP)
%
TP
(%)
11
0.332
0.340
0.00801
102.41%
0.175
194.44%
12
0.332
0.337
0.00497
101.50%
0.175
192.70%
21
0.317
0.319
0.00257
100.81%
0.297
107.74%
22
0.332
0.346
0.01356
104.08%
0.297
116.63%
31
0.332
0.365
0.03253
109.79%
0.175
208.45%
32
0.332
0.358
0.02594
107.81%
0.175
204.68%
41
0.332
0.333
0.00066
100.20%
0.175
190.23%
42
0.332
0.335
0.00265
100.80%
0.175
191.37%
ARS
ARS-
(ARS/EHD)
ARS/TP
ARS
EHD
value
EHD
%
TP
(%)
11
0.400
0.410
0.010
102.60%
0.175
234.51%
12
0.338
0.343
0.005
101.46%
0.175
196.15%
21
0.317
0.319
0.003
100.81%
0.297
107.74%
22
0.350
0.368
0.018
105.17%
0.297
124.15%
31
0.370
0.405
0.034
109.26%
0.175
231.15%
32
0.412
0.439
0.027
106.62%
0.175
250.85%
41
0.503
0.528
0.025
105.06%
0,175
301.99%
42
0.650
0.707
0.057
108.80%
0,175
404.26%
Please refer to
The first lens element 610 has positive refractive power and it is made of plastic material. The first lens element 610 has a convex object-side surface 612 and a concave image-side surface 614, and both of the object-side surface 612 and the image-side surface 614 are aspheric and have one inflection.
The second lens element 620 has positive refractive power and it is made of plastic material. The second lens element 620 has a convex object-side surface 622 and a convex image-side surface 624, and both of the object-side surface 622 and the image-side surface 624 are aspheric and have one inflection.
The third lens element 630 has positive refractive power and it is made of plastic material. The third lens element 630 has a concave object-side surface 632 and a convex image-side surface 634, and both of the object-side surface 632 and the image-side surface 634 are aspheric. The object-side surface 632 has an inflection point.
The fourth lens element 640 has negative refractive power and it is made of plastic material. The fourth lens element 640 has a convex object-side surface 642 and a convex image-side surface 644, and both of the object-side surface 642 and the image-side surface 644 are aspheric. The object-side surface 642 has an inflection point.
The IR-bandstop filter 670 is made of glass material without affecting the focal length of the optical image capturing system and it is disposed between the fourth lens element 640 and the image plane 680.
In the optical image capturing system of the fifth embodiment, the first lens element 610, the second lens element 620, and the third lens element 630 are all positive lens elements, and focal lengths thereof are f1, f2, and f3, respectively. A sum of focal lengths of all lens elements with positive refractive power is ΣPP. The following relation is satisfied: ΣPP=f1+f2+f3. Hereby, it is favorable for allocating the positive refractive power to other positive lens elements and the significant aberrations generated in the process of moving the incident light can be suppressed.
In the optical image capturing system of the fifth embodiment, a sum of focal lengths of all lens elements with negative refractive power is ΣNP. The following relation is satisfied: ΣNP=f4. Hereby, it is favorable for allocating the negative refractive power to other negative lens elements.
Please refer to the following Table 11 and Table 12.
The detailed data of the optical image capturing system of the sixth embodiment is as shown in Table 11.
TABLE 11
Data of the optical image capturing system
f = 1.3290 mm; f/HEP = 2.0; HAF = 37.5120 deg; tan(HAF) = 0.7677
Surface
Thickness
Refractive
Focal
#
Curvature Radius
(mm)
Material
Index
Abbe #
length
0
Object
Plano
At
infinity
1
Lens 1
0.852727177
0.175
Plastic
1.584
29.88
27.43
2
0.831996164
0.091
3
Ape. Stop
Plano
0.054
4
Lens 2
0.761891411
0.289
Plastic
1.545
55.96
1.19
5
−3.904738276
0.165
6
Lens 3
−0.361643479
0.175
Plastic
1.642
22.46
3.29
7
−0.367957202
0.050
8
Lens 4
0.829526508
0.175
Plastic
1.642
22.46
−3.09
9
0.537691373
0.133
10
IR-bandstop
Plano
0.210
BK_7
1.517
64.13
filter
11
Plano
0.403
12
Image
Plano
plane
Reference wavelength = 555 nm; shield position: the first surface with clear aperture of 0.410 mm; the fifth surface with clear aperture (CA) of 0.390 mm.
As for the parameters of the aspheric surfaces of the sixth embodiment, reference is made to Table 12.
TABLE 12
Aspheric Coefficients
Surface
#
1
2
4
5
k =
−1.557647E+01
−3.277776E+01
−2.789439E−01
−2.836680E+01
A4 =
3.496099E+00
4.070620E+00
−1.045470E+00
−1.071473E+00
A6 =
−1.127991E+02
−3.227539E+01
−2.564283E+01
−5.128397E+01
A8 =
3.028273E+03
−2.350251E+03
1.176839E+03
1.010546E+03
A10 =
−5.234801E+04
8.785110E+04
−3.996886E+04
−2.036338E+04
A12 =
5.430169E+05
−1.475501E+06
7.157242E+05
2.273671E+05
A14 =
−3.294190E+06
1.338238E+07
−7.321641E+06
−1.326611E+06
A16 =
1.075724E+07
−6.336433E+07
3.923895E+07
3.816418E+06
A18 =
−1.459442E+07
1.229646E+08
−8.582584E+07
−4.104192E+06
A20 =
1.874288E+01
0.000000E+00
0.000000E+00
0.000000E+00
Surface
#
6
7
8
9
k =
−8.227774E−01
−1.160439E+00
−5.134444E+01
−1.033455E+01
A4 =
−7.042761E−02
−1.595838E+00
−4.577708E−01
−2.412686E+00
A6 =
4.173408E+01
5.861257E+01
−1.934862E+01
1.478557E+01
A8 =
−2.176985E+03
−6.395381E+02
1.955137E+02
−1.211551E+02
A10 =
3.762443E+04
−1.481922E+03
−1.529580E+03
7.099192E+02
A12 =
−2.413331E+05
1.134396E+05
1.081871E+04
−2.582762E+03
A14 =
3.738232E+05
−9.795245E+05
−5.450324E+04
5.449786E+03
A16 =
2.097561E+06
3.407940E+06
1.527241E+05
−6.031428E+03
A18 =
−6.822180E+06
−4.349295E+06
−1.771508E+05
2.609779E+03
A20 =
0.000000E+00
0.000000E+00
0.000000E+00
0.000000E+00
In the sixth embodiment, the presentation of the aspheric surface formula is similar to that in the first embodiment. Besides, the definitions of parameters in following tables are equal to those in the first embodiment, so the repetitious details will not be given here.
The following contents may be deduced from Table 11 and Table 12.
Sixth embodiment (Primary reference wavelength: 555 nm)
InRS41
InRS42
HVT41
HVT42
ODT %
TDT %
−0.04000
−0.03700
0.28600
0.38800
1.30600
0.56600
|f/f1|
|f/f2|
|f/f3|
|f/f4|
|f1/f2|
|f2/f3|
0.04845
1.11400
0.40407
0.43038
22.99413
0.36272
ΣPPR
ΣNPR
ΣPPR/|ENPR|
ΣPP
ΣNP
f1/ΣPP
1.56652
0.43038
3.63989
31.91400
−3.08800
0.85956
f4/ΣNP
IN12/f
IN23/f
IN34/f
TP3/f
TP4/f
1.00000
0.10910
0.12415
0.03762
0.13168
0.13168
InTL
HOS
HOS/HOI
InS/HOS
InTL/HOS
ΣTP/InTL
1.17400
1.92100
1.86868
0.86101
0.61114
0.69336
(TP1 + IN12)/TP2
(TP4 + IN34)/TP3
TP1/TP2
TP3/TP4
IN23/(TP2 + IN23 + TP3)
1.10727
1.28571
0.60554
1.00000
0.26232
|InRS41|/TP4
|InRS42|/TP4
HVT42/HOI
HVT42/HOS
0.2286
0.2114
0.3774
0.2020
IAG1-IAG4
OAG1-OAG4
BSL
25
deg
25
deg
0.01
mm
PSTA
PLTA
NSTA
NLTA
SSTA
SLTA
0.001
mm
0.00022
mm
−0.001
mm
−0.009 mm
0.002 mm
0.004 mm
The following contents may be deduced from Table 11 and Table 12.
Related inflection point values of Sixth Embodiment (Primary reference wavelength: 555 nm)
HIF111
0.3020
HIF111/HOI
0.2938
SGI111
0.0470
| SGI111 |/(| SGI111 | + TP1)
0.2117
HIF121
0.2210
HIF121/HOI
0.2150
SGI121
0.0250
| SGI121 |/(| SGI121 | + TP1)
0.1250
HIF211
0.2120
HIF211/HOI
0.2062
SGI211
0.0270
| SGI211 |/(| SGI211 | + TP2)
0.0854
HIF311
0.2670
HIF311/HOI
0.2597
SGI311
−0.1010
| SGI311 |/(| SGI311 | + TP3)
0.3659
HIF321
0.2720
HIF321/HOI
0.2646
SGI321
−0.0960
| SGI321 |/(| SGI321 | + TP3)
0.3542
HIF411
0.1460
HIF411/HOI
0.1420
SGI411
0.0090
| SGI411 |/(| SGI411 | + TP4)
0.0489
HIF421
0.1790
HIF421/HOI
0.1741
SGI421
0.0230
| SGI421 |/(| SGI421 | + TP4)
0.1162
The relevant data of the length of outline curve may be deduced from Table 11 and Table 12.
Sixth Embodiment (Primary reference wavelength: 555 nm)
ARE
ARE-
2(ARE/HEP)
ARE/TP
ARE
1/2(HEP)
value
1/2(HEP)
%
TP
(%)
11
0.332
0.338
0.00532
101.60%
0.175
192.91%
12
0.332
0.335
0.00270
100.81%
0.175
191.41%
21
0.322
0.325
0.00308
100.96%
0.289
112.53%
22
0.332
0.343
0.01059
103.19%
0.289
118.54%
31
0.332
0.368
0.03559
110.71%
0.175
210.20%
32
0.332
0.362
0.02988
108,99%
0.175
206.94%
41
0.332
0,333
0.00051
100.15%
0.175
190.16%
42
0.332
0.336
0.00328
100.99%
0.175
191.74%
ARS
ARS-
(ARS/EHD)
ARS/TP
ARS
EHD
value
EHD
%
TP
(%)
11
0.410
0.416
0.006
101.51%
0.175
237.82%
12
0.348
0,351
0.003
100.80%
0.175
200.56%
21
0.322
0,325
0.003
100.96%
0.289
112.53%
22
0.350
0,364
0.014
104,06%
0.289
125.92%
31
0.372
0.410
0.038
110.26%
0.175
234.11%
32
0.420
0.453
0.033
107.79%
0.175
258,71%
41
0.523
0.546
0.024
104.52%
0.175
312.24%
42
0.675
0.734
0.059
108.81%
0.175
419.71%
Although the present invention is disclosed by the aforementioned embodiments, those embodiments do not serve to limit the scope of the present invention. A person skilled in the art could perform various alterations and modifications to the present invention, without departing from the spirit and the scope of the present invention. Hence, the scope of the present invention should be defined by the following appended claims.
Despite the fact that the present invention is specifically presented and illustrated with reference to the exemplary embodiments thereof, it should be apparent to a person skilled in the art that, various modifications could be performed to the forms and details of the present invention, without departing from the scope and spirit of the present invention defined in the claims and their equivalence.
Chang, Yeong-Ming, Lai, Chien-Hsun, Liu, Yao-Wei
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